Scippy

SCIP

Solving Constraint Integer Programs

lpi_xprs.c File Reference

Detailed Description

LP interface for Xpress-MP.

Author
Tobias Achterberg
Michael Perregaard
Livio Bertacco
Stefan Heinz

This interface was revised for Xpress 26. Therefore, we removed all legacy code.

Xpress requires that column and row names are unique. Since column and row names are not needed we ignore all column and row names to avoid the uniqueness issue.

Definition in file lpi_xprs.c.

#include <string.h>
#include <assert.h>
#include "xprs.h"
#include "scip/bitencode.h"
#include "lpi/lpi.h"

Go to the source code of this file.

Macros

#define XPRS_LPQUICKPRESOLVE   8207
 
#define XPRS_LP_OPTIMAL_SCALEDINFEAS   16
 
#define CHECK_ZERO(messagehdlr, x)
 
#define ABORT_ZERO(messagehdlr, retval, x)
 
#define COLS_PER_PACKET   SCIP_DUALPACKETSIZE
 
#define ROWS_PER_PACKET   SCIP_DUALPACKETSIZE
 

Typedefs

typedef SCIP_DUALPACKET COLPACKET
 
typedef SCIP_DUALPACKET ROWPACKET
 

Functions

static void invalidateSolution (SCIP_LPI *lpi)
 
Debug check methods
static void debugCheckColrang (SCIP_LPI *lpi, int firstcol, int lastcol)
 
static void debugCheckRowrang (SCIP_LPI *lpi, int firstrow, int lastrow)
 
static void debugCheckObjsen (SCIP_LPI *lpi, SCIP_OBJSEN objsen)
 
Dynamic memory arrays
static SCIP_RETCODE ensureBoundchgMem (SCIP_LPI *lpi, int num)
 
static SCIP_RETCODE ensureSidechgMem (SCIP_LPI *lpi, int num)
 
static SCIP_RETCODE ensureValMem (SCIP_LPI *lpi, int num)
 
static SCIP_RETCODE ensureCstatMem (SCIP_LPI *lpi, int num)
 
static SCIP_RETCODE ensureRstatMem (SCIP_LPI *lpi, int num)
 
LPi state methods
static int colpacketNum (int ncols)
 
static int rowpacketNum (int nrows)
 
static void lpistatePack (SCIP_LPISTATE *lpistate, const int *cstat, const int *rstat)
 
static void lpistateUnpack (const SCIP_LPISTATE *lpistate, int *cstat, int *rstat)
 
static SCIP_RETCODE lpistateCreate (SCIP_LPISTATE **lpistate, BMS_BLKMEM *blkmem, int ncols, int nrows)
 
static void lpistateFree (SCIP_LPISTATE **lpistate, BMS_BLKMEM *blkmem)
 
Conversion methods
static int xprsObjsen (SCIP_OBJSEN const objsen)
 
static void convertSides (SCIP_LPI *lpi, int nrows, const SCIP_Real *lhss, const SCIP_Real *rhss)
 
static void reconvertBothSides (SCIP_LPI *lpi, int nrows, SCIP_Real *lhss, SCIP_Real *rhss)
 
static void reconvertLhs (SCIP_LPI *lpi, int nrows, SCIP_Real *lhss)
 
static void reconvertRhs (SCIP_LPI *lpi, int nrows, SCIP_Real *rhss)
 
static void reconvertSides (SCIP_LPI *lpi, int nrows, SCIP_Real *lhs, SCIP_Real *rhs)
 
LPI Creation and Destruction Methods
SCIP_RETCODE SCIPlpiCreate (SCIP_LPI **lpi, SCIP_MESSAGEHDLR *messagehdlr, const char *name, SCIP_OBJSEN objsen)
 
SCIP_RETCODE SCIPlpiFree (SCIP_LPI **lpi)
 
Modification Methods
SCIP_RETCODE SCIPlpiLoadColLP (SCIP_LPI *lpi, SCIP_OBJSEN objsen, int ncols, const SCIP_Real *obj, const SCIP_Real *lb, const SCIP_Real *ub, char **colnames, int nrows, const SCIP_Real *lhs, const SCIP_Real *rhs, char **rownames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
 
SCIP_RETCODE SCIPlpiAddCols (SCIP_LPI *lpi, int ncols, const SCIP_Real *obj, const SCIP_Real *lb, const SCIP_Real *ub, char **colnames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
 
SCIP_RETCODE SCIPlpiDelCols (SCIP_LPI *lpi, int firstcol, int lastcol)
 
SCIP_RETCODE SCIPlpiDelColset (SCIP_LPI *lpi, int *dstat)
 
SCIP_RETCODE SCIPlpiAddRows (SCIP_LPI *lpi, int nrows, const SCIP_Real *lhs, const SCIP_Real *rhs, char **rownames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
 
SCIP_RETCODE SCIPlpiDelRows (SCIP_LPI *lpi, int firstrow, int lastrow)
 
SCIP_RETCODE SCIPlpiDelRowset (SCIP_LPI *lpi, int *dstat)
 
SCIP_RETCODE SCIPlpiClear (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiChgBounds (SCIP_LPI *lpi, int ncols, const int *ind, const SCIP_Real *lb, const SCIP_Real *ub)
 
SCIP_RETCODE SCIPlpiChgSides (SCIP_LPI *lpi, int nrows, const int *ind, const SCIP_Real *lhs, const SCIP_Real *rhs)
 
SCIP_RETCODE SCIPlpiChgCoef (SCIP_LPI *lpi, int row, int col, SCIP_Real newval)
 
SCIP_RETCODE SCIPlpiChgObjsen (SCIP_LPI *lpi, SCIP_OBJSEN objsense)
 
SCIP_RETCODE SCIPlpiChgObj (SCIP_LPI *lpi, int ncols, int *ind, SCIP_Real *obj)
 
SCIP_RETCODE SCIPlpiScaleRow (SCIP_LPI *lpi, int row, SCIP_Real scaleval)
 
SCIP_RETCODE SCIPlpiScaleCol (SCIP_LPI *lpi, int col, SCIP_Real scaleval)
 
Data Accessing Methods
SCIP_RETCODE SCIPlpiGetNRows (SCIP_LPI *lpi, int *nrows)
 
SCIP_RETCODE SCIPlpiGetNCols (SCIP_LPI *lpi, int *ncols)
 
SCIP_RETCODE SCIPlpiGetNNonz (SCIP_LPI *lpi, int *nnonz)
 
SCIP_RETCODE SCIPlpiGetCols (SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *lb, SCIP_Real *ub, int *nnonz, int *beg, int *ind, SCIP_Real *val)
 
SCIP_RETCODE SCIPlpiGetRows (SCIP_LPI *lpi, int firstrow, int lastrow, SCIP_Real *lhss, SCIP_Real *rhss, int *nnonz, int *beg, int *ind, SCIP_Real *val)
 
SCIP_RETCODE SCIPlpiGetColNames (SCIP_LPI *lpi, int firstcol, int lastcol, char **colnames, char *namestorage, int namestoragesize, int *storageleft)
 
SCIP_RETCODE SCIPlpiGetRowNames (SCIP_LPI *lpi, int firstrow, int lastrow, char **rownames, char *namestorage, int namestoragesize, int *storageleft)
 
SCIP_RETCODE SCIPlpiGetObjsen (SCIP_LPI *lpi, SCIP_OBJSEN *objsen)
 
SCIP_RETCODE SCIPlpiGetObj (SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *vals)
 
SCIP_RETCODE SCIPlpiGetBounds (SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *lbs, SCIP_Real *ubs)
 
SCIP_RETCODE SCIPlpiGetSides (SCIP_LPI *lpi, int firstrow, int lastrow, SCIP_Real *lhss, SCIP_Real *rhss)
 
SCIP_RETCODE SCIPlpiGetCoef (SCIP_LPI *lpi, int row, int col, SCIP_Real *val)
 
Solving Methods
static SCIP_RETCODE lpiSolve (SCIP_LPI *lpi, const char *method)
 
SCIP_RETCODE SCIPlpiSolvePrimal (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiSolveDual (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiSolveBarrier (SCIP_LPI *lpi, SCIP_Bool crossover)
 
SCIP_RETCODE SCIPlpiStartStrongbranch (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiEndStrongbranch (SCIP_LPI *lpi)
 
static SCIP_RETCODE lpiStrongbranch (SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
static SCIP_RETCODE lpiStrongbranches (SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
SCIP_RETCODE SCIPlpiStrongbranchFrac (SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
SCIP_RETCODE SCIPlpiStrongbranchesFrac (SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
SCIP_RETCODE SCIPlpiStrongbranchInt (SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
SCIP_RETCODE SCIPlpiStrongbranchesInt (SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
 
Solution Information Methods
SCIP_Bool SCIPlpiWasSolved (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiGetSolFeasibility (SCIP_LPI *lpi, SCIP_Bool *primalfeasible, SCIP_Bool *dualfeasible)
 
SCIP_Bool SCIPlpiExistsPrimalRay (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiHasPrimalRay (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsPrimalUnbounded (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsPrimalInfeasible (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsPrimalFeasible (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiExistsDualRay (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiHasDualRay (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsDualUnbounded (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsDualInfeasible (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsDualFeasible (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsOptimal (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsStable (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsObjlimExc (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsIterlimExc (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsTimelimExc (SCIP_LPI *lpi)
 
int SCIPlpiGetInternalStatus (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiIgnoreInstability (SCIP_LPI *lpi, SCIP_Bool *success)
 
SCIP_RETCODE SCIPlpiGetObjval (SCIP_LPI *lpi, SCIP_Real *objval)
 
SCIP_RETCODE SCIPlpiGetSol (SCIP_LPI *lpi, SCIP_Real *objval, SCIP_Real *primsol, SCIP_Real *dualsol, SCIP_Real *activity, SCIP_Real *redcost)
 
SCIP_RETCODE SCIPlpiGetPrimalRay (SCIP_LPI *lpi, SCIP_Real *ray)
 
SCIP_RETCODE SCIPlpiGetDualfarkas (SCIP_LPI *lpi, SCIP_Real *dualfarkas)
 
SCIP_RETCODE SCIPlpiGetIterations (SCIP_LPI *lpi, int *iterations)
 
SCIP_RETCODE SCIPlpiGetRealSolQuality (SCIP_LPI *lpi, SCIP_LPSOLQUALITY qualityindicator, SCIP_Real *quality)
 
LP Basis Methods
SCIP_RETCODE SCIPlpiGetBase (SCIP_LPI *lpi, int *cstat, int *rstat)
 
SCIP_RETCODE SCIPlpiSetBase (SCIP_LPI *lpi, int *cstat, int *rstat)
 
SCIP_RETCODE SCIPlpiGetBasisInd (SCIP_LPI *lpi, int *bind)
 
SCIP_RETCODE SCIPlpiGetBInvRow (SCIP_LPI *lpi, int row, SCIP_Real *coef, int *inds, int *ninds)
 
SCIP_RETCODE SCIPlpiGetBInvCol (SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
 
SCIP_RETCODE SCIPlpiGetBInvARow (SCIP_LPI *lpi, int r, const SCIP_Real *binvrow, SCIP_Real *coef, int *inds, int *ninds)
 
SCIP_RETCODE SCIPlpiGetBInvACol (SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
 
LP State Methods
SCIP_RETCODE SCIPlpiGetState (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
 
SCIP_RETCODE SCIPlpiSetState (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE *lpistate)
 
SCIP_RETCODE SCIPlpiClearState (SCIP_LPI *lpi)
 
SCIP_RETCODE SCIPlpiFreeState (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
 
SCIP_Bool SCIPlpiHasStateBasis (SCIP_LPI *lpi, SCIP_LPISTATE *lpistate)
 
SCIP_RETCODE SCIPlpiReadState (SCIP_LPI *lpi, const char *fname)
 
SCIP_RETCODE SCIPlpiWriteState (SCIP_LPI *lpi, const char *fname)
 
LP Pricing Norms Methods
SCIP_RETCODE SCIPlpiGetNorms (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
 
SCIP_RETCODE SCIPlpiSetNorms (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS *lpinorms)
 
SCIP_RETCODE SCIPlpiFreeNorms (SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
 
Parameter Methods
SCIP_RETCODE SCIPlpiGetIntpar (SCIP_LPI *lpi, SCIP_LPPARAM type, int *ival)
 
SCIP_RETCODE SCIPlpiSetIntpar (SCIP_LPI *lpi, SCIP_LPPARAM type, int ival)
 
SCIP_RETCODE SCIPlpiGetRealpar (SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real *dval)
 
SCIP_RETCODE SCIPlpiSetRealpar (SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real dval)
 
Numerical Methods
SCIP_Real SCIPlpiInfinity (SCIP_LPI *lpi)
 
SCIP_Bool SCIPlpiIsInfinity (SCIP_LPI *lpi, SCIP_Real val)
 
File Interface Methods
SCIP_RETCODE SCIPlpiReadLP (SCIP_LPI *lpi, const char *fname)
 
SCIP_RETCODE SCIPlpiWriteLP (SCIP_LPI *lpi, const char *fname)
 

Miscellaneous Methods

static char xprsname [100]
 
const char * SCIPlpiGetSolverName (void)
 
const char * SCIPlpiGetSolverDesc (void)
 
void * SCIPlpiGetSolverPointer (SCIP_LPI *lpi)
 

Macro Definition Documentation

#define XPRS_LPQUICKPRESOLVE   8207

Definition at line 40 of file lpi_xprs.c.

Referenced by lpiSolve().

#define XPRS_LP_OPTIMAL_SCALEDINFEAS   16
#define ABORT_ZERO (   messagehdlr,
  retval,
 
)
Value:
{ int _restat_; \
if( (_restat_ = (x)) != 0 ) \
{ \
SCIPmessagePrintWarning((messagehdlr), "LP Error: Xpress returned %d\n", _restat_); \
SCIPABORT(); \
return retval; \
} \
}

Definition at line 55 of file lpi_xprs.c.

Referenced by SCIPlpiHasDualRay(), SCIPlpiHasPrimalRay(), SCIPlpiIsIterlimExc(), and SCIPlpiIsTimelimExc().

#define COLS_PER_PACKET   SCIP_DUALPACKETSIZE

Definition at line 66 of file lpi_xprs.c.

Referenced by colpacketNum().

#define ROWS_PER_PACKET   SCIP_DUALPACKETSIZE

Definition at line 68 of file lpi_xprs.c.

Referenced by rowpacketNum().

Typedef Documentation

Definition at line 65 of file lpi_xprs.c.

Definition at line 67 of file lpi_xprs.c.

Function Documentation

static void debugCheckColrang ( SCIP_LPI lpi,
int  firstcol,
int  lastcol 
)
static

check that the column range fits

Parameters
lpiLP interface structure
firstcolfirst column to be deleted
lastcollast column to be deleted

Definition at line 128 of file lpi_xprs.c.

References SCIP_LPi::ncols, and SCIP_LPi::xprslp.

Referenced by SCIPlpiDelCols(), and SCIPlpiGetCols().

static void debugCheckRowrang ( SCIP_LPI lpi,
int  firstrow,
int  lastrow 
)
static

check that the row range fits

Parameters
lpiLP interface structure
firstrowfirst row to be deleted
lastrowlast row to be deleted

Definition at line 142 of file lpi_xprs.c.

References SCIP_LPi::nrows, and SCIP_LPi::xprslp.

Referenced by SCIPlpiDelRows(), and SCIPlpiGetRows().

static void debugCheckObjsen ( SCIP_LPI lpi,
SCIP_OBJSEN  objsen 
)
static

check that current objective sense equals the given one

Parameters
lpiLP interface structure
objsenobjective sense to be present

Definition at line 156 of file lpi_xprs.c.

References SCIP_CALL_ABORT, and SCIPlpiGetObjsen().

Referenced by SCIPlpiGetRealpar(), and SCIPlpiSetRealpar().

static SCIP_RETCODE ensureBoundchgMem ( SCIP_LPI lpi,
int  num 
)
static

resizes larray and uarray to have at least num entries and fill it with 'L' and 'U' for the lower and upper bound markers

Parameters
lpiLP interface structure
numminimal number of entries in array

Definition at line 187 of file lpi_xprs.c.

References BMSreallocMemoryArray, SCIP_LPi::boundchgsize, SCIP_LPi::larray, MAX, NULL, SCIP_ALLOC, SCIP_OKAY, and SCIP_LPi::uarray.

Referenced by SCIPlpiChgBounds().

static SCIP_RETCODE ensureSidechgMem ( SCIP_LPI lpi,
int  num 
)
static

resizes senarray, rngarray, and rhsarray to have at least num entries

Parameters
lpiLP interface structure
numminimal number of entries in array

Definition at line 216 of file lpi_xprs.c.

References BMSreallocMemoryArray, MAX, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_ALLOC, SCIP_OKAY, SCIP_LPi::senarray, and SCIP_LPi::sidechgsize.

Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), SCIPlpiGetSides(), SCIPlpiGetSol(), and SCIPlpiLoadColLP().

static SCIP_RETCODE ensureValMem ( SCIP_LPI lpi,
int  num 
)
static

resizes valarray and indarray to have at least num entries

Parameters
lpiLP interface structure
numminimal number of entries in array

Definition at line 240 of file lpi_xprs.c.

References BMSreallocMemoryArray, SCIP_LPi::indarray, MAX, NULL, SCIP_ALLOC, SCIP_OKAY, SCIP_LPi::valarray, and SCIP_LPi::valsize.

Referenced by SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiDelCols(), SCIPlpiDelColset(), SCIPlpiDelRows(), SCIPlpiDelRowset(), SCIPlpiGetBInvACol(), SCIPlpiGetBInvARow(), SCIPlpiGetCols(), SCIPlpiGetRows(), SCIPlpiLoadColLP(), SCIPlpiScaleCol(), and SCIPlpiScaleRow().

static SCIP_RETCODE ensureCstatMem ( SCIP_LPI lpi,
int  num 
)
static

resizes cstat array to have at least num entries

Parameters
lpiLP interface structure
numminimal number of entries in array

Definition at line 263 of file lpi_xprs.c.

References BMSreallocMemoryArray, SCIP_LPi::cstat, SCIP_LPi::cstatsize, MAX, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState(), and SCIPlpiSetState().

static SCIP_RETCODE ensureRstatMem ( SCIP_LPI lpi,
int  num 
)
static

resizes rstat array to have at least num entries

Parameters
lpiLP interface structure
numminimal number of entries in array

Definition at line 285 of file lpi_xprs.c.

References BMSreallocMemoryArray, MAX, NULL, SCIP_LPi::rstat, SCIP_LPi::rstatsize, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState(), and SCIPlpiSetState().

static int colpacketNum ( int  ncols)
static

returns the number of packets needed to store column packet information

Parameters
ncolsnumber of columns to store

Definition at line 315 of file lpi_xprs.c.

References COLS_PER_PACKET.

Referenced by lpistateCreate(), and lpistateFree().

static int rowpacketNum ( int  nrows)
static

returns the number of packets needed to store row packet information

Parameters
nrowsnumber of rows to store

Definition at line 324 of file lpi_xprs.c.

References ROWS_PER_PACKET.

Referenced by lpistateCreate(), and lpistateFree().

static void lpistatePack ( SCIP_LPISTATE lpistate,
const int *  cstat,
const int *  rstat 
)
static

store row and column basis status in a packed LPi state object

Parameters
lpistatepointer to LPi state data
cstatbasis status of columns in unpacked format
rstatbasis status of rows in unpacked format

Definition at line 333 of file lpi_xprs.c.

References SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPencodeDualBit().

Referenced by SCIPlpiGetState().

static void lpistateUnpack ( const SCIP_LPISTATE lpistate,
int *  cstat,
int *  rstat 
)
static

unpacks row and column basis status from a packed LPi state object

Parameters
lpistatepointer to LPi state data
cstatbuffer for storing basis status of columns in unpacked format
rstatbuffer for storing basis status of rows in unpacked format

Definition at line 349 of file lpi_xprs.c.

References SCIP_LPiState::ncols, SCIP_LPiState::nrows, NULL, SCIP_LPiState::packcstat, SCIP_LPiState::packrstat, and SCIPdecodeDualBit().

Referenced by SCIPlpiSetState().

static SCIP_RETCODE lpistateCreate ( SCIP_LPISTATE **  lpistate,
BMS_BLKMEM blkmem,
int  ncols,
int  nrows 
)
static

creates LPi state information object

Parameters
lpistatepointer to LPi state
blkmemblock memory
ncolsnumber of columns to store
nrowsnumber of rows to store

Definition at line 365 of file lpi_xprs.c.

References BMSallocBlockMemory, BMSallocBlockMemoryArray, colpacketNum(), NULL, rowpacketNum(), SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpiGetState().

static void lpistateFree ( SCIP_LPISTATE **  lpistate,
BMS_BLKMEM blkmem 
)
static

frees LPi state information

Parameters
lpistatepointer to LPi state information (like basis information)
blkmemblock memory

Definition at line 386 of file lpi_xprs.c.

References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, colpacketNum(), NULL, and rowpacketNum().

Referenced by SCIPlpiFreeState().

static int xprsObjsen ( SCIP_OBJSEN const  objsen)
static

converts SCIP's objective sense into CPLEX's objective sense

Parameters
objsenobjective sense

Definition at line 410 of file lpi_xprs.c.

References SCIP_OBJSEN_MAXIMIZE, SCIP_OBJSEN_MINIMIZE, SCIPABORT, and SCIPerrorMessage.

Referenced by SCIPlpiChgObjsen().

static void convertSides ( SCIP_LPI lpi,
int  nrows,
const SCIP_Real lhss,
const SCIP_Real rhss 
)
static

converts SCIP's lhs/rhs pairs into Xpress' sen/rhs/rng

Parameters
lpiLP interface structure
nrowsnumber of rows
lhssleft hand side vector
rhssright hand side vector

Definition at line 429 of file lpi_xprs.c.

References SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, and SCIP_LPi::senarray.

Referenced by SCIPlpiAddRows(), SCIPlpiChgSides(), and SCIPlpiLoadColLP().

static void reconvertBothSides ( SCIP_LPI lpi,
int  nrows,
SCIP_Real lhss,
SCIP_Real rhss 
)
static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs

Parameters
lpiLP interface structure
nrowsnumber of rows
lhssbuffer to store the left hand side vector
rhssbuffer to store the right hand side vector

Definition at line 480 of file lpi_xprs.c.

References SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

static void reconvertLhs ( SCIP_LPI lpi,
int  nrows,
SCIP_Real lhss 
)
static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs, only storing the left hand side

Parameters
lpiLP interface structure
nrowsnumber of rows
lhssbuffer to store the left hand side vector

Definition at line 529 of file lpi_xprs.c.

References SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

static void reconvertRhs ( SCIP_LPI lpi,
int  nrows,
SCIP_Real rhss 
)
static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs, only storing the right hand side

Parameters
lpiLP interface structure
nrowsnumber of rows
rhssbuffer to store the right hand side vector

Definition at line 574 of file lpi_xprs.c.

References SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIPABORT, SCIPerrorMessage, and SCIP_LPi::senarray.

Referenced by reconvertSides().

static void reconvertSides ( SCIP_LPI lpi,
int  nrows,
SCIP_Real lhs,
SCIP_Real rhs 
)
static

converts Xpress' sen/rhs/rng triplets into SCIP's lhs/rhs pairs

Parameters
lpiLP interface structure
nrowsnumber of rows
lhsbuffer to store the left hand side vector, or NULL
rhsbuffer to store the right hand side vector, or NULL

Definition at line 619 of file lpi_xprs.c.

References NULL, reconvertBothSides(), reconvertLhs(), and reconvertRhs().

Referenced by SCIPlpiGetSides().

const char* SCIPlpiGetSolverName ( void  )

gets name and version of LP solver

Definition at line 659 of file lpi_xprs.c.

References xprsname.

Referenced by lpFlushChgCols(), lpFlushChgRows(), SCIPcreate(), SCIPlpCreate(), SCIPlpMarkFlushed(), and SCIPprintVersion().

const char* SCIPlpiGetSolverDesc ( void  )

gets description of LP solver (developer, webpage, ...)

Definition at line 675 of file lpi_xprs.c.

Referenced by SCIPcreate().

void* SCIPlpiGetSolverPointer ( SCIP_LPI lpi)

gets pointer for LP solver - use only with great care

Here we return the pointer to the LP environment.

Parameters
lpipointer to an LP interface structure

Definition at line 686 of file lpi_xprs.c.

References SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiCreate ( SCIP_LPI **  lpi,
SCIP_MESSAGEHDLR messagehdlr,
const char *  name,
SCIP_OBJSEN  objsen 
)

creates an LP problem object

Parameters
lpipointer to an LP interface structure
messagehdlrmessage handler to use for printing messages, or NULL
nameproblem name
objsenobjective sense

Definition at line 702 of file lpi_xprs.c.

References BMSallocMemory, CHECK_ZERO, FALSE, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_ALLOC, SCIP_Bool, SCIP_CALL, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiChgObjsen(), SCIPmessagePrintWarning(), and TRUE.

Referenced by addConcaveEstimatorMultivariate(), createLP(), initAlternativeLP(), SCIP_DECL_PARAMCHGD(), SCIPlpComputeRelIntPoint(), and SCIPlpCreate().

SCIP_RETCODE SCIPlpiFree ( SCIP_LPI **  lpi)

deletes an LP problem object

Parameters
lpipointer to an LP interface structure

Definition at line 775 of file lpi_xprs.c.

References BMSfreeMemory, BMSfreeMemoryArrayNull, CHECK_ZERO, NULL, SCIP_OKAY, and SCIPdebugMessage.

Referenced by addConcaveEstimatorMultivariate(), createLP(), SCIP_DECL_CONSEXITSOL(), SCIP_DECL_PARAMCHGD(), SCIPlpComputeRelIntPoint(), SCIPlpFree(), and sepadataFree().

SCIP_RETCODE SCIPlpiLoadColLP ( SCIP_LPI lpi,
SCIP_OBJSEN  objsen,
int  ncols,
const SCIP_Real obj,
const SCIP_Real lb,
const SCIP_Real ub,
char **  colnames,
int  nrows,
const SCIP_Real lhs,
const SCIP_Real rhs,
char **  rownames,
int  nnonz,
const int *  beg,
const int *  ind,
const SCIP_Real val 
)

copies LP data with column matrix into LP solver

Parameters
lpiLP interface structure
objsenobjective sense
ncolsnumber of columns
objobjective function values of columns
lblower bounds of columns
ubupper bounds of columns
colnamescolumn names, or NULL
nrowsnumber of rows
lhsleft hand sides of rows
rhsright hand sides of rows
rownamesrow names, or NULL
nnonznumber of nonzero elements in the constraint matrix
begstart index of each column in ind- and val-array
indrow indices of constraint matrix entries
valvalues of constraint matrix entries

Definition at line 814 of file lpi_xprs.c.

References CHECK_ZERO, convertSides(), ensureSidechgMem(), ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::name, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiChgObjsen(), SCIP_LPi::senarray, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiAddCols ( SCIP_LPI lpi,
int  ncols,
const SCIP_Real obj,
const SCIP_Real lb,
const SCIP_Real ub,
char **  colnames,
int  nnonz,
const int *  beg,
const int *  ind,
const SCIP_Real val 
)

adds columns to the LP

Parameters
lpiLP interface structure
ncolsnumber of columns to be added
objobjective function values of new columns
lblower bounds of new columns
ubupper bounds of new columns
colnamescolumn names, or NULL
nnonznumber of nonzero elements to be added to the constraint matrix
begstart index of each column in ind- and val-array, or NULL if nnonz == 0
indrow indices of constraint matrix entries, or NULL if nnonz == 0
valvalues of constraint matrix entries, or NULL if nnonz == 0

Definition at line 870 of file lpi_xprs.c.

References CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::ncols, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by addAltLPColumn(), addConcaveEstimatorMultivariate(), createLP(), lpFlushAddCols(), SCIP_DECL_PARAMCHGD(), and SCIPlpComputeRelIntPoint().

SCIP_RETCODE SCIPlpiDelCols ( SCIP_LPI lpi,
int  firstcol,
int  lastcol 
)

deletes all columns in the given range from LP

Parameters
lpiLP interface structure
firstcolfirst column to be deleted
lastcollast column to be deleted

Definition at line 906 of file lpi_xprs.c.

References CHECK_ZERO, debugCheckColrang(), ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpFlushDelCols().

SCIP_RETCODE SCIPlpiDelColset ( SCIP_LPI lpi,
int *  dstat 
)

deletes columns from SCIP_LP; the new position of a column must not be greater that its old position

Parameters
lpiLP interface structure
dstatdeletion status of columns input: 1 if column should be deleted, 0 if not output: new position of column, -1 if column was deleted

Definition at line 936 of file lpi_xprs.c.

References CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::ncols, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpDelColset().

SCIP_RETCODE SCIPlpiAddRows ( SCIP_LPI lpi,
int  nrows,
const SCIP_Real lhs,
const SCIP_Real rhs,
char **  rownames,
int  nnonz,
const int *  beg,
const int *  ind,
const SCIP_Real val 
)

adds rows to the LP

Parameters
lpiLP interface structure
nrowsnumber of rows to be added
lhsleft hand sides of new rows
rhsright hand sides of new rows
rownamesrow names, or NULL
nnonznumber of nonzero elements to be added to the constraint matrix
begstart index of each row in ind- and val-array, or NULL if nnonz == 0
indcolumn indices of constraint matrix entries, or NULL if nnonz == 0
valvalues of constraint matrix entries, or NULL if nnonz == 0

Definition at line 985 of file lpi_xprs.c.

References CHECK_ZERO, convertSides(), ensureSidechgMem(), ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::senarray, and SCIP_LPi::xprslp.

Referenced by addAltLPColumn(), addConcaveEstimatorMultivariate(), createLP(), initAlternativeLP(), lpFlushAddRows(), SCIP_DECL_PARAMCHGD(), and SCIPlpComputeRelIntPoint().

SCIP_RETCODE SCIPlpiDelRows ( SCIP_LPI lpi,
int  firstrow,
int  lastrow 
)

deletes all rows in the given range from LP

Parameters
lpiLP interface structure
firstrowfirst row to be deleted
lastrowlast row to be deleted

Definition at line 1023 of file lpi_xprs.c.

References CHECK_ZERO, debugCheckRowrang(), ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpFlushDelRows().

SCIP_RETCODE SCIPlpiDelRowset ( SCIP_LPI lpi,
int *  dstat 
)

deletes rows from SCIP_LP; the new position of a row must not be greater that its old position

Parameters
lpiLP interface structure
dstatdeletion status of rows input: 1 if row should be deleted, 0 if not output: new position of row, -1 if row was deleted

Definition at line 1052 of file lpi_xprs.c.

References CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpDelRowset().

SCIP_RETCODE SCIPlpiClear ( SCIP_LPI lpi)

clears the whole LP

Parameters
lpiLP interface structure

Definition at line 1101 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_LPi::name, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiChgBounds ( SCIP_LPI lpi,
int  ncols,
const int *  ind,
const SCIP_Real lb,
const SCIP_Real ub 
)

changes lower and upper bounds of columns

Parameters
lpiLP interface structure
ncolsnumber of columns to change bounds for
indcolumn indices
lbvalues for the new lower bounds
ubvalues for the new upper bounds

Definition at line 1118 of file lpi_xprs.c.

References CHECK_ZERO, ensureBoundchgMem(), invalidateSolution(), SCIP_LPi::larray, SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIP_LPi::uarray, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), fixAltLPVariable(), fixAltLPVariables(), lpFlushChgCols(), lpLexDualSimplex(), SCIPcomputeConvexEnvelopeFacet(), SCIPconflictAnalyzeStrongbranch(), SCIPlpiScaleCol(), unfixAltLPVariable(), and unfixAltLPVariables().

SCIP_RETCODE SCIPlpiChgSides ( SCIP_LPI lpi,
int  nrows,
const int *  ind,
const SCIP_Real lhs,
const SCIP_Real rhs 
)

changes left and right hand sides of rows

Parameters
lpiLP interface structure
nrowsnumber of rows to change sides for
indrow indices
lhsnew values for left hand sides
rhsnew values for right hand sides

Definition at line 1143 of file lpi_xprs.c.

References CHECK_ZERO, convertSides(), ensureSidechgMem(), invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::senarray, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), lpFlushChgRows(), lpLexDualSimplex(), scaleFirstRow(), SCIPcomputeConvexEnvelopeFacet(), and SCIPlpiScaleRow().

SCIP_RETCODE SCIPlpiChgCoef ( SCIP_LPI lpi,
int  row,
int  col,
SCIP_Real  newval 
)

changes a single coefficient

Parameters
lpiLP interface structure
rowrow number of coefficient to change
colcolumn number of coefficient to change
newvalnew value of coefficient

Definition at line 1173 of file lpi_xprs.c.

References CHECK_ZERO, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPlpiScaleCol(), SCIPlpiScaleRow(), updateFirstRow(), updateFirstRowGlobal(), and updateObjUpperbound().

SCIP_RETCODE SCIPlpiChgObjsen ( SCIP_LPI lpi,
SCIP_OBJSEN  objsense 
)

changes the objective sense

Parameters
lpiLP interface structure
objsensenew objective sense

Definition at line 1193 of file lpi_xprs.c.

References CHECK_ZERO, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::xprslp, and xprsObjsen().

Referenced by SCIPlpiCreate(), and SCIPlpiLoadColLP().

SCIP_RETCODE SCIPlpiChgObj ( SCIP_LPI lpi,
int  ncols,
int *  ind,
SCIP_Real obj 
)

changes objective values of columns in the LP

Parameters
lpiLP interface structure
ncolsnumber of columns to change objective value for
indcolumn indices to change objective value for
objnew objective values for columns

Definition at line 1211 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpFlushChgCols(), lpLexDualSimplex(), SCIPcomputeConvexEnvelopeFacet(), SCIPlpiScaleCol(), setAltLPObj(), and setAltLPObjZero().

SCIP_RETCODE SCIPlpiScaleRow ( SCIP_LPI lpi,
int  row,
SCIP_Real  scaleval 
)

multiplies a row with a non-zero scalar; for negative scalars, the row's sense is switched accordingly

Parameters
lpiLP interface structure
rowrow number to scale
scalevalscaling multiplier

Definition at line 1229 of file lpi_xprs.c.

References CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::ncols, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiChgCoef(), SCIPlpiChgSides(), SCIPlpiGetRows(), SCIP_LPi::valarray, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiScaleCol ( SCIP_LPI lpi,
int  col,
SCIP_Real  scaleval 
)

multiplies a column with a non-zero scalar; the objective value is multiplied with the scalar, and the bounds are divided by the scalar; for negative scalars, the column's bounds are switched

Parameters
lpiLP interface structure
colcolumn number to scale
scalevalscaling multiplier

Definition at line 1287 of file lpi_xprs.c.

References CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, invalidateSolution(), SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiChgBounds(), SCIPlpiChgCoef(), SCIPlpiChgObj(), SCIPlpiGetCols(), SCIPlpiGetObj(), SCIP_LPi::valarray, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiGetNRows ( SCIP_LPI lpi,
int *  nrows 
)

gets the number of rows in the LP

Parameters
lpiLP interface structure
nrowspointer to store the number of rows

Definition at line 1359 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by addAltLPColumn(), SCIPcomputeConvexEnvelopeFacet(), and SCIPlpFlush().

SCIP_RETCODE SCIPlpiGetNCols ( SCIP_LPI lpi,
int *  ncols 
)

gets the number of columns in the LP

Parameters
lpiLP interface structure
ncolspointer to store the number of cols

Definition at line 1376 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by addAltLPColumn(), checkIISlocal(), checkLPBoundsClean(), extendToCover(), scaleFirstRow(), SCIPcomputeConvexEnvelopeFacet(), SCIPlpComputeRelIntPoint(), and SCIPlpFlush().

SCIP_RETCODE SCIPlpiGetNNonz ( SCIP_LPI lpi,
int *  nnonz 
)

gets the number of nonzero elements in the LP constraint matrix

Parameters
lpiLP interface structure
nnonzpointer to store the number of nonzeros

Definition at line 1393 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPlpiGetCols(), and SCIPlpiGetRows().

SCIP_RETCODE SCIPlpiGetCols ( SCIP_LPI lpi,
int  firstcol,
int  lastcol,
SCIP_Real lb,
SCIP_Real ub,
int *  nnonz,
int *  beg,
int *  ind,
SCIP_Real val 
)

gets columns from LP problem object; the arrays have to be large enough to store all values Either both, lb and ub, have to be NULL, or both have to be non-NULL, either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.

Parameters
lpiLP interface structure
firstcolfirst column to get from LP
lastcollast column to get from LP
lbbuffer to store the lower bound vector, or NULL
ubbuffer to store the upper bound vector, or NULL
nnonzpointer to store the number of nonzero elements returned, or NULL
begbuffer to store start index of each column in ind- and val-array, or NULL
indbuffer to store column indices of constraint matrix entries, or NULL
valbuffer to store values of constraint matrix entries, or NULL

Definition at line 1413 of file lpi_xprs.c.

References CHECK_ZERO, debugCheckColrang(), ensureValMem(), SCIP_LPi::indarray, SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetNNonz(), and SCIP_LPi::xprslp.

Referenced by SCIPlpiScaleCol().

SCIP_RETCODE SCIPlpiGetRows ( SCIP_LPI lpi,
int  firstrow,
int  lastrow,
SCIP_Real lhss,
SCIP_Real rhss,
int *  nnonz,
int *  beg,
int *  ind,
SCIP_Real val 
)

gets rows from LP problem object; the arrays have to be large enough to store all values. Either both, lhs and rhs, have to be NULL, or both have to be non-NULL, either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.

Parameters
lpiLP interface structure
firstrowfirst row to get from LP
lastrowlast row to get from LP
lhssbuffer to store left hand side vector, or NULL
rhssbuffer to store right hand side vector, or NULL
nnonzpointer to store the number of nonzero elements returned, or NULL
begbuffer to store start index of each row in ind- and val-array, or NULL
indbuffer to store row indices of constraint matrix entries, or NULL
valbuffer to store values of constraint matrix entries, or NULL

Definition at line 1483 of file lpi_xprs.c.

References CHECK_ZERO, debugCheckRowrang(), ensureValMem(), SCIP_LPi::indarray, SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetNNonz(), SCIPlpiGetSides(), and SCIP_LPi::xprslp.

Referenced by scaleFirstRow(), and SCIPlpiScaleRow().

SCIP_RETCODE SCIPlpiGetColNames ( SCIP_LPI lpi,
int  firstcol,
int  lastcol,
char **  colnames,
char *  namestorage,
int  namestoragesize,
int *  storageleft 
)

gets column names

Parameters
lpiLP interface structure
firstcolfirst column to get name from LP
lastcollast column to get name from LP
colnamespointers to column names (of size at least lastcol-firstcol+1)
namestoragestorage for col names
namestoragesizesize of namestorage (if 0, storageleft returns the storage needed)
storageleftamount of storage left (if < 0 the namestorage was not big enough)

Definition at line 1550 of file lpi_xprs.c.

References SCIP_LPERROR, and SCIPerrorMessage.

SCIP_RETCODE SCIPlpiGetRowNames ( SCIP_LPI lpi,
int  firstrow,
int  lastrow,
char **  rownames,
char *  namestorage,
int  namestoragesize,
int *  storageleft 
)

gets row names

Parameters
lpiLP interface structure
firstrowfirst row to get name from LP
lastrowlast row to get name from LP
rownamespointers to row names (of size at least lastrow-firstrow+1)
namestoragestorage for row names
namestoragesizesize of namestorage (if 0, -storageleft returns the storage needed)
storageleftamount of storage left (if < 0 the namestorage was not big enough)

Definition at line 1565 of file lpi_xprs.c.

References SCIP_LPERROR, and SCIPerrorMessage.

SCIP_RETCODE SCIPlpiGetObjsen ( SCIP_LPI lpi,
SCIP_OBJSEN objsen 
)

gets the objective sense of the LP

Parameters
lpiLP interface structure
objsenpointer to store objective sense

Definition at line 1580 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_OBJSEN_MAXIMIZE, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, and SCIP_LPi::xprslp.

Referenced by debugCheckObjsen(), lpiStrongbranch(), and lpiStrongbranches().

SCIP_RETCODE SCIPlpiGetObj ( SCIP_LPI lpi,
int  firstcol,
int  lastcol,
SCIP_Real vals 
)

gets objective coefficients from LP problem object

Parameters
lpiLP interface structure
firstcolfirst column to get objective coefficient for
lastcollast column to get objective coefficient for
valsarray to store objective coefficients

Definition at line 1600 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpFlushChgCols(), lpLexDualSimplex(), SCIPlpiScaleCol(), and SCIPlpMarkFlushed().

SCIP_RETCODE SCIPlpiGetBounds ( SCIP_LPI lpi,
int  firstcol,
int  lastcol,
SCIP_Real lbs,
SCIP_Real ubs 
)

gets current bounds from LP problem object

Parameters
lpiLP interface structure
firstcolfirst column to get bounds for
lastcollast column to get bounds for
lbsarray to store lower bound values, or NULL
ubsarray to store upper bound values, or NULL

Definition at line 1620 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by checkLPBoundsClean(), lpFlushChgCols(), lpLexDualSimplex(), and SCIPlpMarkFlushed().

SCIP_RETCODE SCIPlpiGetSides ( SCIP_LPI lpi,
int  firstrow,
int  lastrow,
SCIP_Real lhss,
SCIP_Real rhss 
)

gets current row sides from LP problem object

Parameters
lpiLP interface structure
firstrowfirst row to get sides for
lastrowlast row to get sides for
lhssarray to store left hand side values, or NULL
rhssarray to store right hand side values, or NULL

Definition at line 1648 of file lpi_xprs.c.

References CHECK_ZERO, ensureSidechgMem(), SCIP_LPi::messagehdlr, NULL, reconvertSides(), SCIP_LPi::rhsarray, SCIP_LPi::rngarray, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::senarray, and SCIP_LPi::xprslp.

Referenced by lpFlushChgRows(), lpLexDualSimplex(), SCIPlpiGetRows(), SCIPlpMarkFlushed(), and undoBdchgsDualfarkas().

SCIP_RETCODE SCIPlpiGetCoef ( SCIP_LPI lpi,
int  row,
int  col,
SCIP_Real val 
)

gets a single coefficient

Parameters
lpiLP interface structure
rowrow number of coefficient
colcolumn number of coefficient
valpointer to store the value of the coefficient

Definition at line 1677 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, and SCIP_LPi::xprslp.

Referenced by SCIPdummyDebugMethodForSun(), and updateObjUpperbound().

static SCIP_RETCODE lpiSolve ( SCIP_LPI lpi,
const char *  method 
)
static
SCIP_RETCODE SCIPlpiSolvePrimal ( SCIP_LPI lpi)

calls primal simplex to solve the LP

startFinishOptions - bits 1 - do not delete work areas and factorization at end 2 - use old factorization if same number of rows 4 - skip as much initialization of work areas as possible (work in progress)

4 does not seem to work.

Primal algorithm

Parameters
lpiLP interface structure

Definition at line 1775 of file lpi_xprs.c.

References lpiSolve(), and SCIP_LPi::solmethod.

Referenced by checkAltLPInfeasible(), lpLexDualSimplex(), lpPrimalSimplex(), SCIP_DECL_PARAMCHGD(), and SCIPcomputeConvexEnvelopeFacet().

SCIP_RETCODE SCIPlpiSolveDual ( SCIP_LPI lpi)

calls dual simplex to solve the LP

startFinishOptions - bits 1 - do not delete work areas and factorization at end 2 - use old factorization if same number of rows 4 - skip as much initialization of work areas as possible (work in progress)

4 does not seem to work.

Dual algorithm

Parameters
lpiLP interface structure

Definition at line 1784 of file lpi_xprs.c.

References lpiSolve(), and SCIP_LPi::solmethod.

Referenced by addConcaveEstimatorMultivariate(), checkAltLPInfeasible(), conflictAnalyzeLP(), lpDualSimplex(), lpLexDualSimplex(), SCIPcomputeConvexEnvelopeFacet(), SCIPconflictAnalyzeStrongbranch(), and SCIPlpComputeRelIntPoint().

SCIP_RETCODE SCIPlpiSolveBarrier ( SCIP_LPI lpi,
SCIP_Bool  crossover 
)

calls barrier or interior point algorithm to solve the LP with crossover to simplex basis

Parameters
lpiLP interface structure
crossoverperform crossover

Definition at line 1793 of file lpi_xprs.c.

References CHECK_ZERO, lpiSolve(), SCIP_LPi::messagehdlr, NULL, SCIP_LPi::solisbasic, SCIP_LPi::solmethod, TRUE, and SCIP_LPi::xprslp.

Referenced by lpBarrier().

SCIP_RETCODE SCIPlpiStartStrongbranch ( SCIP_LPI lpi)

start strong branching - call before any strong branching

Parameters
lpiLP interface structure

Definition at line 1815 of file lpi_xprs.c.

References SCIP_OKAY.

Referenced by SCIPconflictAnalyzeStrongbranch(), and SCIPlpStartStrongbranch().

SCIP_RETCODE SCIPlpiEndStrongbranch ( SCIP_LPI lpi)

end strong branching - call after any strong branching

Parameters
lpiLP interface structure

Definition at line 1824 of file lpi_xprs.c.

References SCIP_OKAY.

Referenced by SCIPconflictAnalyzeStrongbranch(), and SCIPlpEndStrongbranch().

static SCIP_RETCODE lpiStrongbranch ( SCIP_LPI lpi,
int  col,
SCIP_Real  psol,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)
static

performs strong branching iterations on one candidate

Parameters
lpiLP interface structure
colcolumn to apply strong branching on
psolcurrent primal solution value of column
itlimiteration limit for strong branchings
downstores dual bound after branching column down
upstores dual bound after branching column up
downvalidstores whether the returned down value is a valid dual bound; otherwise, it can only be used as an estimate value
upvalidstores whether the returned up value is a valid dual bound; otherwise, it can only be used as an estimate value
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 1834 of file lpi_xprs.c.

References CHECK_ZERO, EPSCEIL, EPSFLOOR, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_CALL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetObjsen(), TRUE, and SCIP_LPi::xprslp.

Referenced by SCIPlpiStrongbranchFrac(), and SCIPlpiStrongbranchInt().

static SCIP_RETCODE lpiStrongbranches ( SCIP_LPI lpi,
int *  cols,
int  ncols,
SCIP_Real psols,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)
static

performs strong branching iterations on given candidates

Parameters
lpiLP interface structure
colscolumns to apply strong branching on
ncolsnumber of columns
psolscurrent primal solution values of columns (might be integral)
itlimiteration limit for strong branchings
downstores dual bounds after branching columns down
upstores dual bounds after branching columns up
downvalidstores whether the returned down values are valid dual bounds; otherwise, they can only be used as an estimate values
upvalidstores whether the returned up values are a valid dual bounds; otherwise, they can only be used as an estimate values
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 1918 of file lpi_xprs.c.

References BMSallocMemoryArray, BMSfreeMemoryArray, CHECK_ZERO, EPSCEIL, EPSFLOOR, FALSE, SCIP_LPi::messagehdlr, SCIP_LPi::ncols, NULL, SCIP_ALLOC, SCIP_CALL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIPdebugMessage, SCIPlpiGetObjsen(), TRUE, and SCIP_LPi::xprslp.

Referenced by SCIPlpiStrongbranchesFrac(), and SCIPlpiStrongbranchesInt().

SCIP_RETCODE SCIPlpiStrongbranchFrac ( SCIP_LPI lpi,
int  col,
SCIP_Real  psol,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)

performs strong branching iterations on one fractional candidate

Parameters
lpiLP interface structure
colcolumn to apply strong branching on
psolfractional current primal solution value of column
itlimiteration limit for strong branchings
downstores dual bound after branching column down
upstores dual bound after branching column up
downvalidstores whether the returned down value is a valid dual bound; otherwise, it can only be used as an estimate value
upvalidstores whether the returned up value is a valid dual bound; otherwise, it can only be used as an estimate value
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 2024 of file lpi_xprs.c.

References lpiStrongbranch(), SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPcolGetStrongbranch().

SCIP_RETCODE SCIPlpiStrongbranchesFrac ( SCIP_LPI lpi,
int *  cols,
int  ncols,
SCIP_Real psols,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)

performs strong branching iterations on given fractional candidates

Parameters
lpiLP interface structure
colscolumns to apply strong branching on
ncolsnumber of columns
psolsfractional current primal solution values of columns
itlimiteration limit for strong branchings
downstores dual bounds after branching columns down
upstores dual bounds after branching columns up
downvalidstores whether the returned down values are valid dual bounds; otherwise, they can only be used as an estimate values
upvalidstores whether the returned up values are a valid dual bounds; otherwise, they can only be used as an estimate values
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 2045 of file lpi_xprs.c.

References lpiStrongbranches(), SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPcolGetStrongbranches().

SCIP_RETCODE SCIPlpiStrongbranchInt ( SCIP_LPI lpi,
int  col,
SCIP_Real  psol,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)

performs strong branching iterations on one candidate with integral value

Parameters
lpiLP interface structure
colcolumn to apply strong branching on
psolcurrent integral primal solution value of column
itlimiteration limit for strong branchings
downstores dual bound after branching column down
upstores dual bound after branching column up
downvalidstores whether the returned down value is a valid dual bound; otherwise, it can only be used as an estimate value
upvalidstores whether the returned up value is a valid dual bound; otherwise, it can only be used as an estimate value
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 2067 of file lpi_xprs.c.

References lpiStrongbranch(), SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPcolGetStrongbranch().

SCIP_RETCODE SCIPlpiStrongbranchesInt ( SCIP_LPI lpi,
int *  cols,
int  ncols,
SCIP_Real psols,
int  itlim,
SCIP_Real down,
SCIP_Real up,
SCIP_Bool downvalid,
SCIP_Bool upvalid,
int *  iter 
)

performs strong branching iterations on given candidates with integral values

Parameters
lpiLP interface structure
colscolumns to apply strong branching on
ncolsnumber of columns
psolscurrent integral primal solution values of columns
itlimiteration limit for strong branchings
downstores dual bounds after branching columns down
upstores dual bounds after branching columns up
downvalidstores whether the returned down values are valid dual bounds; otherwise, they can only be used as an estimate values
upvalidstores whether the returned up values are a valid dual bounds; otherwise, they can only be used as an estimate values
iterstores total number of strong branching iterations, or -1; may be NULL

Definition at line 2088 of file lpi_xprs.c.

References lpiStrongbranches(), SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPcolGetStrongbranches().

SCIP_Bool SCIPlpiWasSolved ( SCIP_LPI lpi)

returns whether a solve method was called after the last modification of the LP

Parameters
lpiLP interface structure

Definition at line 2118 of file lpi_xprs.c.

References NULL, and SCIP_LPi::solstat.

Referenced by performStrongbranchWithPropagation(), and SCIPconflictAnalyzeLP().

SCIP_RETCODE SCIPlpiGetSolFeasibility ( SCIP_LPI lpi,
SCIP_Bool primalfeasible,
SCIP_Bool dualfeasible 
)

gets information about primal and dual feasibility of the current LP solution

here "true" should mean feasible, "false" should mean unknown

Parameters
lpiLP interface structure
primalfeasiblestores primal feasibility status
dualfeasiblestores dual feasibility status

Definition at line 2131 of file lpi_xprs.c.

References NULL, SCIP_Bool, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::solmethod, SCIP_LPi::solstat, XPRS_LP_OPTIMAL_SCALEDINFEAS, and SCIP_LPi::xprslp.

Referenced by lpAlgorithm().

SCIP_Bool SCIPlpiExistsPrimalRay ( SCIP_LPI lpi)

returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point); this does not necessarily mean, that the solver knows and can return the primal ray

Parameters
lpiLP interface structure

Definition at line 2153 of file lpi_xprs.c.

References NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by checkAltLPInfeasible(), and lpSolve().

SCIP_Bool SCIPlpiHasPrimalRay ( SCIP_LPI lpi)

returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point), and the solver knows and can return the primal ray

Parameters
lpiLP interface structure

Definition at line 2167 of file lpi_xprs.c.

References ABORT_ZERO, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by lpSolve(), SCIPlpGetPrimalRay(), and SCIPlpGetUnboundedSol().

SCIP_Bool SCIPlpiIsPrimalUnbounded ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be primal feasible and unbounded

Parameters
lpiLP interface structure

Definition at line 2184 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solmethod, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), and checkAltLPInfeasible().

SCIP_Bool SCIPlpiIsPrimalInfeasible ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be primal infeasible

Parameters
lpiLP interface structure

Definition at line 2203 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by checkAltLPInfeasible(), conflictAnalyzeLP(), lpSolve(), SCIP_DECL_PARAMCHGD(), and SCIPconflictAnalyzeLP().

SCIP_Bool SCIPlpiIsPrimalFeasible ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be primal feasible

Parameters
lpiLP interface structure

Definition at line 2217 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solmethod, SCIP_LPi::solstat, XPRS_LP_OPTIMAL_SCALEDINFEAS, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), and lpSolve().

SCIP_Bool SCIPlpiExistsDualRay ( SCIP_LPI lpi)

returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point); this does not necessarily mean, that the solver knows and can return the dual ray

Parameters
lpiLP interface structure

Definition at line 2234 of file lpi_xprs.c.

References NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

SCIP_Bool SCIPlpiHasDualRay ( SCIP_LPI lpi)

returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point), and the solver knows and can return the dual ray

Parameters
lpiLP interface structure

Definition at line 2248 of file lpi_xprs.c.

References ABORT_ZERO, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by lpSolve(), SCIPlpSolveAndEval(), and undoBdchgsDualfarkas().

SCIP_Bool SCIPlpiIsDualUnbounded ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be dual unbounded

Parameters
lpiLP interface structure

Definition at line 2264 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solmethod, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

SCIP_Bool SCIPlpiIsDualInfeasible ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be dual infeasible

Parameters
lpiLP interface structure

Definition at line 2278 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

SCIP_Bool SCIPlpiIsDualFeasible ( SCIP_LPI lpi)

returns TRUE iff LP is proven to be dual feasible

Parameters
lpiLP interface structure

Definition at line 2292 of file lpi_xprs.c.

References NULL, SCIPdebugMessage, SCIP_LPi::solmethod, SCIP_LPi::solstat, XPRS_LP_OPTIMAL_SCALEDINFEAS, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), lpSolve(), and performStrongbranchWithPropagation().

SCIP_Bool SCIPlpiIsOptimal ( SCIP_LPI lpi)

returns TRUE iff LP was solved to optimality

Parameters
lpiLP interface structure

Definition at line 2307 of file lpi_xprs.c.

References NULL, SCIP_LPi::solstat, XPRS_LP_OPTIMAL_SCALEDINFEAS, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), checkAltLPInfeasible(), conflictAnalyzeLP(), lpLexDualSimplex(), lpSolve(), and SCIPlpComputeRelIntPoint().

SCIP_Bool SCIPlpiIsStable ( SCIP_LPI lpi)

returns TRUE iff current LP basis is stable

Parameters
lpiLP interface structure

Definition at line 2319 of file lpi_xprs.c.

References FALSE, NULL, SCIPdebugMessage, SCIP_LPi::solstat, TRUE, XPRS_LP_OPTIMAL_SCALEDINFEAS, and SCIP_LPi::xprslp.

Referenced by checkAltLPInfeasible(), and lpSolveStable().

SCIP_Bool SCIPlpiIsObjlimExc ( SCIP_LPI lpi)

returns TRUE iff the objective limit was reached

Parameters
lpiLP interface structure

Definition at line 2353 of file lpi_xprs.c.

References NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), conflictAnalyzeLP(), lpSolve(), and SCIPlpSolveAndEval().

SCIP_Bool SCIPlpiIsIterlimExc ( SCIP_LPI lpi)

returns TRUE iff the iteration limit was reached

Parameters
lpiLP interface structure

Definition at line 2365 of file lpi_xprs.c.

References ABORT_ZERO, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_LPi::solstat, TRUE, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), lpSolve(), lpSolveStable(), and SCIPlpComputeRelIntPoint().

SCIP_Bool SCIPlpiIsTimelimExc ( SCIP_LPI lpi)

returns TRUE iff the time limit was reached

Parameters
lpiLP interface structure

Definition at line 2386 of file lpi_xprs.c.

References ABORT_ZERO, FALSE, SCIP_LPi::messagehdlr, NULL, SCIP_LPi::solstat, TRUE, and SCIP_LPi::xprslp.

Referenced by lpSolve(), and SCIPlpComputeRelIntPoint().

int SCIPlpiGetInternalStatus ( SCIP_LPI lpi)

returns the internal solution status of the solver

Parameters
lpiLP interface structure

Definition at line 2407 of file lpi_xprs.c.

References NULL, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by checkAltLPInfeasible(), and lpSolve().

SCIP_RETCODE SCIPlpiIgnoreInstability ( SCIP_LPI lpi,
SCIP_Bool success 
)

tries to reset the internal status of the LP solver in order to ignore an instability of the last solving call

Parameters
lpiLP interface structure
successpointer to store, whether the instability could be ignored

Definition at line 2418 of file lpi_xprs.c.

References NULL, SCIP_OKAY, TRUE, and SCIP_LPi::xprslp.

Referenced by lpSolveStable().

SCIP_RETCODE SCIPlpiGetObjval ( SCIP_LPI lpi,
SCIP_Real objval 
)

gets objective value of solution

Parameters
lpiLP interface structure
objvalstores the objective value

Definition at line 2433 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), lpSolve(), performStrongbranchWithPropagation(), SCIPlpSolveAndEval(), and undoBdchgsDualsol().

SCIP_RETCODE SCIPlpiGetSol ( SCIP_LPI lpi,
SCIP_Real objval,
SCIP_Real primsol,
SCIP_Real dualsol,
SCIP_Real activity,
SCIP_Real redcost 
)

gets primal and dual solution vectors

Parameters
lpiLP interface structure
objvalstores the objective value, may be NULL if not needed
primsolprimal solution vector, may be NULL if not needed
dualsoldual solution vector, may be NULL if not needed
activityrow activity vector, may be NULL if not needed
redcostreduced cost vector, may be NULL if not needed

Definition at line 2449 of file lpi_xprs.c.

References CHECK_ZERO, ensureSidechgMem(), SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_LPi::rhsarray, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), extendToCover(), lpLexDualSimplex(), SCIPcomputeConvexEnvelopeFacet(), SCIPlpComputeRelIntPoint(), SCIPlpGetSol(), SCIPlpGetUnboundedSol(), and undoBdchgsDualsol().

SCIP_RETCODE SCIPlpiGetPrimalRay ( SCIP_LPI lpi,
SCIP_Real ray 
)

gets primal ray for unbounded LPs

Unbounded ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays.

Parameters
lpiLP interface structure
rayprimal ray

Definition at line 2491 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetPrimalRay(), and SCIPlpGetUnboundedSol().

SCIP_RETCODE SCIPlpiGetDualfarkas ( SCIP_LPI lpi,
SCIP_Real dualfarkas 
)

gets dual Farkas proof for infeasibility

Infeasibility ray (NULL returned if none/wrong). Up to user to use delete [] on these arrays.

Parameters
lpiLP interface structure
dualfarkasdual Farkas row multipliers

Definition at line 2512 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_LPERROR, SCIP_OKAY, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetDualfarkas(), and undoBdchgsDualfarkas().

SCIP_RETCODE SCIPlpiGetIterations ( SCIP_LPI lpi,
int *  iterations 
)

gets the number of LP iterations of the last solve call

Parameters
lpiLP interface structure
iterationspointer to store the number of iterations of the last solve call

Definition at line 2533 of file lpi_xprs.c.

References SCIP_LPi::iterations, NULL, SCIP_OKAY, SCIP_LPi::solstat, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), SCIPconflictAnalyzeStrongbranch(), and SCIPlpGetIterations().

SCIP_RETCODE SCIPlpiGetRealSolQuality ( SCIP_LPI lpi,
SCIP_LPSOLQUALITY  qualityindicator,
SCIP_Real quality 
)

gets information about the quality of an LP solution

Such information is usually only available, if also a (maybe not optimal) solution is available. The LPI should return SCIP_INVALID for quality, if the requested quantity is not available.

Parameters
lpiLP interface structure
qualityindicatorindicates which quality should be returned
qualitypointer to store quality number

Definition at line 2553 of file lpi_xprs.c.

References NULL, SCIP_INVALID, and SCIP_OKAY.

Referenced by checkAltLPInfeasible(), SCIP_DECL_DISPOUTPUT(), and SCIPprintLPSolutionQuality().

SCIP_RETCODE SCIPlpiGetBase ( SCIP_LPI lpi,
int *  cstat,
int *  rstat 
)

gets current basis status for columns and rows; arrays must be large enough to store the basis status

Parameters
lpiLP interface structure
cstatarray to store column basis status, or NULL
rstatarray to store row basis status, or NULL

Definition at line 2576 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpLexDualSimplex(), SCIPconflictAnalyzeStrongbranch(), SCIPlpGetBase(), and SCIPlpGetSol().

SCIP_RETCODE SCIPlpiSetBase ( SCIP_LPI lpi,
int *  cstat,
int *  rstat 
)

sets current basis status for columns and rows

Whats changed since last solve. Is only used when startFinishOptions used in dual or primal. Bit 1 - number of rows/columns has not changed (so work arrays valid) 2 - matrix has not changed 4 - if matrix has changed only by adding rows 8 - if matrix has changed only by adding columns 16 - row lbs not changed 32 - row ubs not changed 64 - column objective not changed 128 - column lbs not changed 256 - column ubs not changed 512 - basis not changed (up to user to set this to 0) top bits may be used internally

Parameters
lpiLP interface structure
cstatarray with column basis status
rstatarray with row basis status

Definition at line 2593 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::clearstate, FALSE, invalidateSolution(), SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPconflictAnalyzeStrongbranch().

SCIP_RETCODE SCIPlpiGetBasisInd ( SCIP_LPI lpi,
int *  bind 
)

returns the indices of the basic columns and rows; basic column n gives value n, basic row m gives value -1-m

Parameters
lpiLP interface structure
bindpointer to store basis indices ready to keep number of rows entries

Definition at line 2616 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetBasisInd().

SCIP_RETCODE SCIPlpiGetBInvRow ( SCIP_LPI lpi,
int  row,
SCIP_Real coef,
int *  inds,
int *  ninds 
)

get dense row of inverse basis matrix B^-1

Note
The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated; see also the explanation in lpi.h.
Parameters
lpiLP interface structure
rowrow number
coefpointer to store the coefficients of the row
indsarray to store the non-zero indices
nindspointer to store the number of non-zero indices (-1: if we do not store sparsity informations)

Definition at line 2663 of file lpi_xprs.c.

References BMSclearMemoryArray, CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetBInvRow(), and SCIPlpiGetBInvARow().

SCIP_RETCODE SCIPlpiGetBInvCol ( SCIP_LPI lpi,
int  c,
SCIP_Real coef,
int *  inds,
int *  ninds 
)

get dense column of inverse basis matrix B^-1

Note
The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated; see also the explanation in lpi.h.
Parameters
lpiLP interface structure
ccolumn number of B^-1; this is NOT the number of the column in the LP; you have to call SCIPlpiGetBasisInd() to get the array which links the B^-1 column numbers to the row and column numbers of the LP! c must be between 0 and nrows-1, since the basis has the size nrows * nrows
coefpointer to store the coefficients of the column
indsarray to store the non-zero indices
nindspointer to store the number of non-zero indices (-1: if we do not store sparsity informations)

Definition at line 2699 of file lpi_xprs.c.

References BMSclearMemoryArray, CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetBInvCol().

SCIP_RETCODE SCIPlpiGetBInvARow ( SCIP_LPI lpi,
int  r,
const SCIP_Real binvrow,
SCIP_Real coef,
int *  inds,
int *  ninds 
)

get dense row of inverse basis matrix times constraint matrix B^-1 * A

Note
The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated; see also the explanation in lpi.h.
Parameters
lpiLP interface structure
rrow number
binvrowrow in (A_B)^-1 from prior call to SCIPlpiGetBInvRow(), or NULL
coefvector to return coefficients
indsarray to store the non-zero indices
nindspointer to store the number of non-zero indices (-1: if we do not store sparsity informations)

Definition at line 2739 of file lpi_xprs.c.

References BMSallocMemoryArray, BMSfreeMemoryArrayNull, CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, SCIP_LPi::messagehdlr, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_ALLOC, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiGetBInvRow(), SCIP_LPi::valarray, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetBInvARow().

SCIP_RETCODE SCIPlpiGetBInvACol ( SCIP_LPI lpi,
int  c,
SCIP_Real coef,
int *  inds,
int *  ninds 
)

get dense column of inverse basis matrix times constraint matrix B^-1 * A

Note
The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated; see also the explanation in lpi.h.
Parameters
lpiLP interface structure
ccolumn number
coefvector to return coefficients
indsarray to store the non-zero indices
nindspointer to store the number of non-zero indices (-1: if we do not store sparsity informations)

Definition at line 2814 of file lpi_xprs.c.

References BMSclearMemoryArray, CHECK_ZERO, ensureValMem(), SCIP_LPi::indarray, SCIP_LPi::messagehdlr, SCIP_LPi::nrows, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::valarray, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetBInvACol().

SCIP_RETCODE SCIPlpiGetState ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPISTATE **  lpistate 
)

stores LPi state (like basis information) into lpistate object

Parameters
lpiLP interface structure
blkmemblock memory
lpistatepointer to LPi state information (like basis information)

Definition at line 2866 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::clearstate, SCIP_LPi::cstat, ensureCstatMem(), ensureRstatMem(), lpistateCreate(), lpistatePack(), SCIP_LPi::messagehdlr, SCIP_LPi::ncols, SCIP_LPi::nrows, NULL, SCIP_LPi::rstat, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIP_LPi::solisbasic, and SCIP_LPi::xprslp.

Referenced by SCIPlpGetState(), and SCIPlpStartDive().

SCIP_RETCODE SCIPlpiSetState ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPISTATE lpistate 
)

loads LPi state (like basis information) into solver; note that the LP might have been extended with additional columns and rows since the state was stored with SCIPlpiGetState()

Parameters
lpiLP interface structure
blkmemblock memory
lpistateLPi state information (like basis information)

Definition at line 2917 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::clearstate, SCIP_LPi::cstat, ensureCstatMem(), ensureRstatMem(), FALSE, lpistateUnpack(), SCIP_LPi::messagehdlr, SCIP_LPi::ncols, SCIP_LPiState::ncols, SCIP_LPi::nrows, SCIP_LPiState::nrows, NULL, REALABS, SCIP_LPi::rstat, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPlpiIsInfinity(), and SCIP_LPi::xprslp.

Referenced by SCIPlpSetState().

SCIP_RETCODE SCIPlpiClearState ( SCIP_LPI lpi)

clears current LPi state (like basis information) of the solver

Parameters
lpiLP interface structure

Definition at line 2988 of file lpi_xprs.c.

References SCIP_LPi::clearstate, NULL, SCIP_OKAY, and TRUE.

Referenced by SCIPtreeEndProbing().

SCIP_RETCODE SCIPlpiFreeState ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPISTATE **  lpistate 
)

frees LPi state information

Parameters
lpiLP interface structure
blkmemblock memory
lpistatepointer to LPi state information (like basis information)

Definition at line 3001 of file lpi_xprs.c.

References lpistateFree(), NULL, and SCIP_OKAY.

Referenced by SCIPlpFreeState().

SCIP_Bool SCIPlpiHasStateBasis ( SCIP_LPI lpi,
SCIP_LPISTATE lpistate 
)

checks, whether the given LP state contains simplex basis information

Parameters
lpiLP interface structure
lpistateLP state information (like basis information)

Definition at line 3019 of file lpi_xprs.c.

References NULL.

Referenced by SCIPlpSetState().

SCIP_RETCODE SCIPlpiReadState ( SCIP_LPI lpi,
const char *  fname 
)

reads LP state (like basis information from a file

Read a basis from the given filename, returns -1 on file error, 0 if no values, 1 if values

Parameters
lpiLP interface structure
fnamefile name

Definition at line 3029 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiWriteState ( SCIP_LPI lpi,
const char *  fname 
)

writes LP state (like basis information) to a file

Write the basis in MPS format to the specified file. If writeValues true, writes values of structurals (and adds VALUES to end of NAME card)

parameters:

  • filename
  • bool writeValues
  • int formatType (0 - normal, 1 - extra accuracy, 2 - IEEE hex)
Parameters
lpiLP interface structure
fnamefile name

Definition at line 3045 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiGetNorms ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPINORMS **  lpinorms 
)

stores LPi pricing norms information

Parameters
lpiLP interface structure
blkmemblock memory
lpinormspointer to LPi pricing norms information

Definition at line 3071 of file lpi_xprs.c.

References NULL, and SCIP_OKAY.

Referenced by SCIPlpGetNorms().

SCIP_RETCODE SCIPlpiSetNorms ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPINORMS lpinorms 
)

loads LPi pricing norms into solver; note that the LP might have been extended with additional columns and rows since the state was stored with SCIPlpiGetNorms()

Parameters
lpiLP interface structure
blkmemblock memory
lpinormsLPi pricing norms information

Definition at line 3087 of file lpi_xprs.c.

References NULL, and SCIP_OKAY.

Referenced by SCIPlpSetNorms().

SCIP_RETCODE SCIPlpiFreeNorms ( SCIP_LPI lpi,
BMS_BLKMEM blkmem,
SCIP_LPINORMS **  lpinorms 
)

frees pricing norms information

Parameters
lpiLP interface structure
blkmemblock memory
lpinormspointer to LPi pricing norms information

Definition at line 3100 of file lpi_xprs.c.

References NULL, and SCIP_OKAY.

Referenced by SCIPlpFreeNorms().

SCIP_RETCODE SCIPlpiGetIntpar ( SCIP_LPI lpi,
SCIP_LPPARAM  type,
int *  ival 
)

gets integer parameter of LP

Parameters
lpiLP interface structure
typeparameter number
ivalbuffer to store the parameter value

Definition at line 3121 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, SCIP_LPi::notfromscratch, NULL, SCIP_LPi::par_presolve, SCIP_LPi::pricing, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_SCALING, SCIP_LPPAR_THREADS, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by lpCheckIntpar(), and SCIPlpStartDive().

SCIP_RETCODE SCIPlpiSetIntpar ( SCIP_LPI lpi,
SCIP_LPPARAM  type,
int  ival 
)

sets integer parameter of LP

Amount of print out: 0 - none 1 - just final 2 - just factorizations 3 - as 2 plus a bit more 4 - verbose above that 8,16,32 etc just for selective SCIPdebug

Parameters
lpiLP interface structure
typeparameter number
ivalparameter value

Definition at line 3177 of file lpi_xprs.c.

References CHECK_ZERO, FALSE, SCIP_LPi::messagehdlr, MIN, SCIP_LPi::notfromscratch, NULL, SCIP_LPi::par_presolve, SCIP_LPi::pricing, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_SCALING, SCIP_LPPAR_THREADS, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIP_PRICING_AUTO, SCIP_PRICING_DEVEX, SCIP_PRICING_LPIDEFAULT, SCIP_PRICING_PARTIAL, SCIPdebugMessage, TRUE, and SCIP_LPi::xprslp.

Referenced by addConcaveEstimatorMultivariate(), checkAltLPInfeasible(), conflictAnalyzeLP(), extendToCover(), initAlternativeLP(), lpSetIntpar(), SCIP_DECL_CONSCHECK(), and SCIPlpComputeRelIntPoint().

SCIP_RETCODE SCIPlpiGetRealpar ( SCIP_LPI lpi,
SCIP_LPPARAM  type,
SCIP_Real dval 
)

gets floating point parameter of LP

Parameters
lpiLP interface structure
typeparameter number
dvalbuffer to store the parameter value

Definition at line 3239 of file lpi_xprs.c.

References CHECK_ZERO, debugCheckObjsen(), SCIP_LPi::messagehdlr, NULL, SCIP_LPPAR_BARRIERCONVTOL, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LOBJLIM, SCIP_LPPAR_LPTILIM, SCIP_LPPAR_MARKOWITZ, SCIP_LPPAR_UOBJLIM, SCIP_OBJSEN_MAXIMIZE, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by conflictAnalyzeLP(), and lpCheckRealpar().

SCIP_Bool SCIPlpiIsInfinity ( SCIP_LPI lpi,
SCIP_Real  val 
)

checks if given value is treated as infinity in the LP solver

Parameters
lpiLP interface structure
valvalue to be checked for infinity

Definition at line 3358 of file lpi_xprs.c.

References NULL.

Referenced by addBdchg(), checkLPBoundsClean(), performStrongbranchWithPropagation(), and SCIPlpiSetState().

SCIP_RETCODE SCIPlpiReadLP ( SCIP_LPI lpi,
const char *  fname 
)

reads LP from a file

read file in MPS format parameters: filename bool keepNames bool ignoreErrors

Parameters
lpiLP interface structure
fnamefile name

Definition at line 3376 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

SCIP_RETCODE SCIPlpiWriteLP ( SCIP_LPI lpi,
const char *  fname 
)

writes LP to a file

write file in MPS format parameters: filename int formatType (0 - normal, 1 - extra accuracy, 2 - IEEE hex) int numberAcross (1 or 2 values should be specified on every data line in the MPS file) double objSense

Parameters
lpiLP interface structure
fnamefile name

Definition at line 3392 of file lpi_xprs.c.

References CHECK_ZERO, SCIP_LPi::messagehdlr, NULL, SCIP_OKAY, SCIPdebugMessage, and SCIP_LPi::xprslp.

Referenced by addAltLPColumn(), SCIP_DECL_PARAMCHGD(), SCIPlpComputeRelIntPoint(), SCIPlpWrite(), and updateObjUpperbound().

Variable Documentation

char xprsname[100]
static

Definition at line 656 of file lpi_xprs.c.

Referenced by SCIPlpiGetSolverName().