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 4836 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 4839 of file cuts.c.

Referenced by computeLiftingData(), destroyLiftingData(), evaluateLiftingFunction(), generateLiftedFlowCoverCut(), 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 4840 of file cuts.c.

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

◆ r

int LiftingData::r

◆ t

int LiftingData::t

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

Definition at line 4847 of file cuts.c.

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

◆ 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 4848 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 4849 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 4851 of file cuts.c.

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

◆ ml

SCIP_Real LiftingData::ml

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

Definition at line 4852 of file cuts.c.

Referenced by computeLiftingData(), and evaluateLiftingFunction().