Scippy

SCIP

Solving Constraint Integer Programs

Detailed Description

public methods for LP columns

Functions

SCIP_EXPORT void SCIPcolSort (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetObj (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetLb (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetUb (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetBestBound (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetPrimsol (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetMinPrimsol (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPcolGetMaxPrimsol (SCIP_COL *col)
 
SCIP_EXPORT SCIP_BASESTAT SCIPcolGetBasisStatus (SCIP_COL *col)
 
SCIP_EXPORT SCIP_VARSCIPcolGetVar (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetIndex (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Bool SCIPcolIsIntegral (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Bool SCIPcolIsRemovable (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetLPPos (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetLPDepth (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Bool SCIPcolIsInLP (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetNNonz (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetNLPNonz (SCIP_COL *col)
 
SCIP_EXPORT SCIP_ROW ** SCIPcolGetRows (SCIP_COL *col)
 
SCIP_EXPORT SCIP_RealSCIPcolGetVals (SCIP_COL *col)
 
SCIP_EXPORT SCIP_Longint SCIPcolGetStrongbranchNode (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetNStrongbranchs (SCIP_COL *col)
 
SCIP_EXPORT int SCIPcolGetAge (SCIP_COL *col)
 
SCIP_EXPORT SCIP_BOUNDTYPE SCIPboundtypeOpposite (SCIP_BOUNDTYPE boundtype)
 
SCIP_EXPORT SCIP_Real SCIPgetColRedcost (SCIP *scip, SCIP_COL *col)
 
SCIP_EXPORT SCIP_Real SCIPgetColFarkasCoef (SCIP *scip, SCIP_COL *col)
 
SCIP_EXPORT void SCIPmarkColNotRemovableLocal (SCIP *scip, SCIP_COL *col)
 

Function Documentation

◆ SCIPcolSort()

SCIP_EXPORT void SCIPcolSort ( SCIP_COL col)

sorts column entries such that LP rows precede non-LP rows and inside both parts lower row indices precede higher ones

Parameters
colcolumn to be sorted

Definition at line 3424 of file lp.c.

References colSortLP(), and colSortNonLP().

Referenced by SCIP_DECL_HEUREXEC().

◆ SCIPcolGetObj()

SCIP_EXPORT SCIP_Real SCIPcolGetObj ( SCIP_COL col)

gets objective value of column

Parameters
colLP column

Definition at line 16812 of file lp.c.

References NULL, and SCIP_Col::obj.

Referenced by computeCut(), createSubscip(), SCIPvarGetObjLP(), and transformColumn().

◆ SCIPcolGetLb()

SCIP_EXPORT SCIP_Real SCIPcolGetLb ( SCIP_COL col)

◆ SCIPcolGetUb()

SCIP_EXPORT SCIP_Real SCIPcolGetUb ( SCIP_COL col)

◆ SCIPcolGetBestBound()

SCIP_EXPORT SCIP_Real SCIPcolGetBestBound ( SCIP_COL col)

gets best bound of column with respect to the objective function

Parameters
colLP column

Definition at line 16842 of file lp.c.

References SCIP_Col::lb, NULL, SCIP_Col::obj, and SCIP_Col::ub.

Referenced by lpCleanupCols(), lpRemoveObsoleteCols(), and SCIProwRecalcPseudoActivity().

◆ SCIPcolGetPrimsol()

◆ SCIPcolGetMinPrimsol()

SCIP_EXPORT SCIP_Real SCIPcolGetMinPrimsol ( SCIP_COL col)

gets the minimal LP solution value, this column ever assumed

Parameters
colLP column

Definition at line 16868 of file lp.c.

References SCIP_Col::minprimsol, and NULL.

Referenced by propagateRedcostVar().

◆ SCIPcolGetMaxPrimsol()

SCIP_EXPORT SCIP_Real SCIPcolGetMaxPrimsol ( SCIP_COL col)

gets the maximal LP solution value, this column ever assumed

Parameters
colLP column

Definition at line 16878 of file lp.c.

References SCIP_Col::maxprimsol, and NULL.

Referenced by propagateRedcostVar().

◆ SCIPcolGetBasisStatus()

SCIP_EXPORT SCIP_BASESTAT SCIPcolGetBasisStatus ( SCIP_COL col)

gets the basis status of a column in the LP solution; only valid for LPs with status SCIP_LPSOLSTAT_OPTIMAL and with SCIPisLPSolBasic(scip) == TRUE; returns SCIP_BASESTAT_ZERO for columns not in the current SCIP_LP

Parameters
colLP column

Definition at line 16890 of file lp.c.

References SCIP_Col::basisstatus, SCIP_Col::lppos, NULL, and SCIP_BASESTAT_ZERO.

Referenced by filterExistingLP(), generateDisjCutSOS1(), getGMIFromRow(), getImplVarRedcost(), getSimplexCoefficients(), propagateRedcostBinvar(), propagateRedcostVar(), propagateRootRedcostBinvar(), SCIP_DECL_SEPAEXECLP(), SCIPlpGetDegeneracy(), SCIPprobUpdateBestRootSol(), and SCIPvarGetImplRedcost().

◆ SCIPcolGetVar()

◆ SCIPcolGetIndex()

SCIP_EXPORT int SCIPcolGetIndex ( SCIP_COL col)

gets unique index of col

Parameters
colLP col

Definition at line 16911 of file lp.c.

References SCIP_Col::index, and NULL.

◆ SCIPcolIsIntegral()

◆ SCIPcolIsRemovable()

SCIP_EXPORT SCIP_Bool SCIPcolIsRemovable ( SCIP_COL col)

returns TRUE iff column is removable from the LP (due to aging or cleanup)

Parameters
colLP column

Definition at line 16932 of file lp.c.

References NULL, and SCIP_Col::removable.

◆ SCIPcolGetLPPos()

◆ SCIPcolGetLPDepth()

SCIP_EXPORT int SCIPcolGetLPDepth ( SCIP_COL col)

gets depth in the tree where the column entered the LP, or -1 if it is not in LP

Parameters
colLP column

Definition at line 16953 of file lp.c.

References SCIP_Col::lpdepth, SCIP_Col::lppos, and NULL.

◆ SCIPcolIsInLP()

◆ SCIPcolGetNNonz()

SCIP_EXPORT int SCIPcolGetNNonz ( SCIP_COL col)

get number of nonzero entries in column vector

Parameters
colLP column

Definition at line 16975 of file lp.c.

References SCIP_Col::len, and NULL.

Referenced by calcBdchgScore(), calcBranchScore(), checkConstraintMatching(), determineBound(), SCIPapplyLockFixings(), SCIPpricestoreAddProbVars(), SCIPsolAdjustImplicitSolVals(), shiftValues(), varColCompare(), and varProcessBoundChanges().

◆ SCIPcolGetNLPNonz()

SCIP_EXPORT int SCIPcolGetNLPNonz ( SCIP_COL col)

get number of nonzero entries in column vector, that correspond to rows currently in the SCIP_LP;

Warning
This method is only applicable on columns, that are completely linked to their rows (e.g. a column that is in the current LP and the LP was solved, or a column that was in a solved LP and didn't change afterwards
Parameters
colLP column

Definition at line 16989 of file lp.c.

References SCIP_Col::nlprows, NULL, and SCIP_Col::nunlinked.

Referenced by addFracCounter(), calcShiftVal(), calculateBounds(), createSubscip(), extractNodes(), getIncidentNodes(), getNActiveConsScore(), getNextFlowrow(), initMatrix(), relaxVar(), rowFindSlackVar(), SCIP_DECL_HEUREXEC(), setupAggregationData(), transformColumn(), tryFixVar(), updateActivities(), updateRowActivities(), and updateSlacks().

◆ SCIPcolGetRows()

◆ SCIPcolGetVals()

◆ SCIPcolGetStrongbranchNode()

SCIP_EXPORT SCIP_Longint SCIPcolGetStrongbranchNode ( SCIP_COL col)

gets node number of the last node in current branch and bound run, where strong branching was used on the given column, or -1 if strong branching was never applied to the column in current run

Parameters
colLP column

Definition at line 17022 of file lp.c.

References NULL, and SCIP_Col::sbnode.

Referenced by SCIPgetVarStrongbranchNode().

◆ SCIPcolGetNStrongbranchs()

SCIP_EXPORT int SCIPcolGetNStrongbranchs ( SCIP_COL col)

gets number of times, strong branching was applied in current run on the given column

Parameters
colLP column

Definition at line 17032 of file lp.c.

References SCIP_Col::nsbcalls, and NULL.

Referenced by SCIPgetVarNStrongbranchs().

◆ SCIPcolGetAge()

SCIP_EXPORT int SCIPcolGetAge ( SCIP_COL col)

gets the age of a column, i.e., the total number of successive times a column was in the LP and was 0.0 in the solution

Parameters
colLP column

Definition at line 17042 of file lp.c.

References SCIP_Col::age, and NULL.

◆ SCIPboundtypeOpposite()

SCIP_EXPORT SCIP_BOUNDTYPE SCIPboundtypeOpposite ( SCIP_BOUNDTYPE  boundtype)

◆ SCIPgetColRedcost()

SCIP_EXPORT SCIP_Real SCIPgetColRedcost ( SCIP scip,
SCIP_COL col 
)

returns the reduced costs of a column in the last (feasible) LP

Returns
the reduced costs of a column in the last (feasible) LP
Precondition
this method can be called in one of the following stages of the SCIP solving process:
Note
calling this method in SCIP_STAGE_SOLVED is only recommended to experienced users and should only be called for pure LP instances (without presolving)
The return value of this method should be used carefully if the dual feasibility check was explictely disabled.
Parameters
scipSCIP data structure
colLP column

Definition at line 1100 of file scip_lp.c.

References FALSE, Scip::lp, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage(), SCIPcolGetRedcost(), SCIPerrorMessage, SCIPtreeHasCurrentNodeLP(), Scip::stat, Scip::tree, and TRUE.

Referenced by determineVariableFixings(), propagateRedcostBinvar(), propagateRedcostVar(), and SCIPgetVarRedcost().

◆ SCIPgetColFarkasCoef()

SCIP_EXPORT SCIP_Real SCIPgetColFarkasCoef ( SCIP scip,
SCIP_COL col 
)

returns the Farkas coefficient of a column in the last (infeasible) LP

Returns
the Farkas coefficient of a column in the last (infeasible) LP
Precondition
this method can be called in one of the following stages of the SCIP solving process:

returns the Farkas coefficient of a column in the last (infeasible) LP

Returns
the Farkas coefficient of a column in the last (infeasible) LP
Precondition
this method can be called in one of the following stages of the SCIP solving process:
Parameters
scipSCIP data structure
colLP column

Definition at line 1126 of file scip_lp.c.

References FALSE, Scip::lp, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage(), SCIPcolGetFarkasCoef(), SCIPerrorMessage, SCIPtreeHasCurrentNodeLP(), Scip::stat, Scip::tree, and TRUE.

Referenced by SCIPgetVarFarkasCoef().

◆ SCIPmarkColNotRemovableLocal()

SCIP_EXPORT void SCIPmarkColNotRemovableLocal ( SCIP scip,
SCIP_COL col 
)

marks a column to be not removable from the LP in the current node

Precondition
this method can be called in the following stage of the SCIP solving process:
Parameters
scipSCIP data structure
colLP column

Definition at line 1148 of file scip_lp.c.

References FALSE, SCIP_CALL_ABORT, SCIPcheckStage(), SCIPcolMarkNotRemovableLocal(), Scip::stat, and TRUE.