Scippy

SCIP

Solving Constraint Integer Programs

nlpi_ipopt.h File Reference

Detailed Description

Ipopt NLP interface.

Author
Stefan Vigerske
Benjamin Müller

Definition in file nlpi_ipopt.h.

#include "nlpi/type_nlpi.h"

Go to the source code of this file.

Functions

SCIP_RETCODE SCIPcreateNlpSolverIpopt (BMS_BLKMEM *blkmem, SCIP_NLPI **nlpi)
 
const char * SCIPgetSolverNameIpopt (void)
 
const char * SCIPgetSolverDescIpopt (void)
 
SCIP_Bool SCIPisIpoptAvailableIpopt (void)
 
void * SCIPgetIpoptApplicationPointerIpopt (SCIP_NLPIPROBLEM *nlpiproblem)
 
void * SCIPgetNlpiOracleIpopt (SCIP_NLPIPROBLEM *nlpiproblem)
 
void SCIPsetModifiedDefaultSettingsIpopt (SCIP_NLPI *nlpi, const char *optionsstring)
 
SCIP_RETCODE LapackDsyev (SCIP_Bool computeeigenvectors, int N, SCIP_Real *a, SCIP_Real *w)
 
SCIP_RETCODE SCIPsolveLinearProb (int N, SCIP_Real *A, SCIP_Real *b, SCIP_Real *x, SCIP_Bool *success)
 

Function Documentation

SCIP_RETCODE SCIPcreateNlpSolverIpopt ( BMS_BLKMEM *  blkmem,
SCIP_NLPI **  nlpi 
)

create solver interface for Ipopt solver sets *nlpi to NULL if Ipopt is not available

Parameters
blkmemblock memory data structure
nlpipointer to buffer for nlpi address
const char* SCIPgetSolverNameIpopt ( void  )

gets string that identifies Ipopt (version number)

const char* SCIPgetSolverDescIpopt ( void  )

gets string that describes Ipopt (version number)

SCIP_Bool SCIPisIpoptAvailableIpopt ( void  )

returns whether Ipopt is available, i.e., whether it has been linked in

void* SCIPgetIpoptApplicationPointerIpopt ( SCIP_NLPIPROBLEM nlpiproblem)

gives a pointer to the IpoptApplication object stored in Ipopt-NLPI's NLPI problem data structure

Parameters
nlpiproblemNLP problem of Ipopt-NLPI
void* SCIPgetNlpiOracleIpopt ( SCIP_NLPIPROBLEM nlpiproblem)

gives a pointer to the NLPIORACLE object stored in Ipopt-NLPI's NLPI problem data structure

Parameters
nlpiproblemNLP problem of Ipopt-NLPI
void SCIPsetModifiedDefaultSettingsIpopt ( SCIP_NLPI nlpi,
const char *  optionsstring 
)

sets modified default settings that are used when setting up an Ipopt problem

Do not forget to add a newline after the last option in optionsstring.

Parameters
nlpiIpopt NLP interface
optionsstringstring with options as in Ipopt options file
SCIP_RETCODE LapackDsyev ( SCIP_Bool  computeeigenvectors,
int  N,
SCIP_Real a,
SCIP_Real w 
)

Calls Lapacks Dsyev routine to compute eigenvalues and eigenvectors of a dense matrix. It's here, because Ipopt is linked against Lapack.

Parameters
computeeigenvectorsshould also eigenvectors should be computed ?
Ndimension
amatrix data on input (size N*N); eigenvectors on output if computeeigenvectors == TRUE
wbuffer to store eigenvalues (size N)
SCIP_RETCODE SCIPsolveLinearProb ( int  N,
SCIP_Real A,
SCIP_Real b,
SCIP_Real x,
SCIP_Bool success 
)

solves a linear problem of the form Ax = b for a regular matrix A

Calls Lapacks IpLapackDgetrf routine to calculate a LU factorization and uses this factorization to solve the linear problem Ax = b. It's here, because Ipopt is linked against Lapack.

Parameters
Ndimension
Amatrix data on input (size N*N); filled column-wise
bright hand side vector (size N)
xbuffer to store solution (size N)
successpointer to store if the solving routine was successful