Scippy

SCIP

Solving Constraint Integer Programs

LiftingData Struct Reference

Detailed Description

structure that contains all data required to perform the sequence independent lifting

Definition at line 4932 of file cuts.c.

Data Fields

SCIP_RealM
 
SCIP_Realm
 
int r
 
int t
 
SCIP_Real d1
 
SCIP_Real d2
 
SCIP_Real lambda
 
SCIP_Real mp
 
SCIP_Real ml
 

Field Documentation

◆ M

SCIP_Real* LiftingData::M

\( M_0 := 0.0 \) and \( M_i := M_i-1 + m_i \)

Definition at line 4935 of file cuts.c.

Referenced by computeLiftingData(), destroyLiftingData(), evaluateLiftingFunction(), and getAlphaAndBeta().

◆ m

SCIP_Real* LiftingData::m

non-increasing array of variable upper bound coefficients for all variables in \( C^{++} \) and \( L^- \), where \( C = C^+ \cup C^- \) is the flowcover and \( C^{++} := \{ j \in C^+ \mid u_j > \lambda \} \) \( L^- := \{ j \in (N^- \setminus C^-) \mid u_j > \lambda \} \)

Definition at line 4936 of file cuts.c.

Referenced by computeLiftingData(), destroyLiftingData(), and evaluateLiftingFunction().

◆ r

int LiftingData::r

size of array m

Definition at line 4942 of file cuts.c.

Referenced by computeLiftingData(), cutsSubstituteStrongCG(), evaluateLiftingFunction(), and getAlphaAndBeta().

◆ t

int LiftingData::t

index of smallest value in m that comes from a variable in \( C^{++} \)

Definition at line 4943 of file cuts.c.

Referenced by computeLiftingData(), and evaluateLiftingFunction().

◆ d1

SCIP_Real LiftingData::d1

right hand side of single-node-flow set plus the sum of all \( u_j \) for \( j \in C^- \)

Definition at line 4944 of file cuts.c.

Referenced by computeLiftingData(), and generateLiftedFlowCoverCut().

◆ d2

SCIP_Real LiftingData::d2

right hand side of single-node-flow set plus the sum of all \( u_j \) for \( j \in N^- \)

Definition at line 4945 of file cuts.c.

Referenced by computeLiftingData().

◆ lambda

SCIP_Real LiftingData::lambda

◆ mp

SCIP_Real LiftingData::mp

smallest variable bound coefficient of variable in \( C^{++} (min_{j \in C++} u_j) \)

Definition at line 4947 of file cuts.c.

Referenced by computeLiftingData(), and evaluateLiftingFunction().

◆ ml

SCIP_Real LiftingData::ml

\( ml := min(\lambda, \sum_{j \in C^+ \setminus C^{++}} u_j) \)

Definition at line 4948 of file cuts.c.

Referenced by computeLiftingData(), and evaluateLiftingFunction().