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_VAR *	SCIPcolGetVar (SCIP_COL *col)

SCIP_EXPORT int	SCIPcolGetIndex (SCIP_COL *col)

SCIP_EXPORT int	SCIPcolGetVarProbindex (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_Real *	SCIPcolGetVals (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

col	column 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

col LP column

Definition at line 16815 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 )

gets lower bound of column

Parameters

col LP column

Definition at line 16825 of file lp.c.

References SCIP_Col::lb, and NULL.

Referenced by computeCut(), createSubscip(), generateDisjCutSOS1(), getGMIFromRow(), modifyAndPackCut(), propagateRedcostVar(), provedBound(), SCIP_DECL_SEPAEXECLP(), SCIPlpGetDegeneracy(), SCIPlpGetDualfarkas(), and SCIPvarGetLbLP().

◆ SCIPcolGetUb()

SCIP_EXPORT SCIP_Real SCIPcolGetUb ( SCIP_COL * col )

gets upper bound of column

Parameters

col LP column

Definition at line 16835 of file lp.c.

References NULL, and SCIP_Col::ub.

Referenced by computeCut(), createSubscip(), generateDisjCutSOS1(), getGMIFromRow(), modifyAndPackCut(), propagateRedcostVar(), provedBound(), SCIP_DECL_SEPAEXECLP(), SCIPlpGetDegeneracy(), SCIPlpGetDualfarkas(), and SCIPvarGetUbLP().

◆ SCIPcolGetBestBound()

SCIP_EXPORT SCIP_Real SCIPcolGetBestBound ( SCIP_COL * col )

gets best bound of column with respect to the objective function

Parameters

col LP column

Definition at line 16845 of file lp.c.

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

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

◆ SCIPcolGetPrimsol()

SCIP_EXPORT SCIP_Real SCIPcolGetPrimsol ( SCIP_COL * col )

gets the primal LP solution of a column

Parameters

col LP column

Definition at line 16858 of file lp.c.

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

Referenced by branchcandCalcLPCands(), checkNumerics(), createCGMIPprimalsols(), createSubscip(), getImplVarRedcost(), nodepairqueueCreate(), SCIP_DECL_HEUREXEC(), SCIP_DECL_SEPAEXECLP(), SCIPprobUpdateBestRootSol(), SCIPvarGetImplRedcost(), SCIPvarGetLPSol(), and SCIPvarGetLPSol_rec().

◆ SCIPcolGetMinPrimsol()

SCIP_EXPORT SCIP_Real SCIPcolGetMinPrimsol ( SCIP_COL * col )

gets the minimal LP solution value, this column ever assumed

Parameters

col LP column

Definition at line 16871 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

col LP column

Definition at line 16881 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

col LP column

Definition at line 16893 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()

SCIP_EXPORT SCIP_VAR* SCIPcolGetVar ( SCIP_COL * col )

gets variable this column represents

Parameters

col LP column

Definition at line 16904 of file lp.c.

References NULL, and SCIP_Col::var.

Referenced by addAltLPRow(), applyRepair(), colIsDiscrete(), computeCut(), copyCuts(), createCGCutDirect(), createCGMIPprimalsols(), createRows(), createSubscip(), extractCapacityRows(), extractFlowRows(), findUncapacitatedArcs(), generateAverageNBRay(), generateClusterCuts(), generateCut(), generateCutUnboundedLP(), generateDisjCutSOS1(), initMatrix(), isConvexLocal(), lpCopyIntegrality(), mcfnetworkExtract(), mcfnetworkFill(), mod2MatrixAddOrigRow(), nodepairqueueCreate(), nodepartitionIsConnected(), rowCalculateGauss(), rowFindSlackVar(), SCIP_DECL_EVENTEXEC(), SCIP_DECL_HEUREXEC(), SCIP_DECL_SEPAEXECLP(), SCIP_DECL_SORTPTRCOMP(), SCIPaddNlpiProbRows(), SCIPaddRow(), SCIPapplyLockFixings(), SCIPcomputeLPRelIntPoint(), SCIPconflictAnalyzeStrongbranch(), SCIPnlrowCreateFromRow(), SCIPsolLinkLPSol(), selectRounding(), selectShifting(), sepastoreApplyBdchg(), sepastoreIsBdchgApplicable(), storeCuts(), transformColumn(), transformNonIntegralRow(), and transformVariable().

◆ SCIPcolGetIndex()

SCIP_EXPORT int SCIPcolGetIndex ( SCIP_COL * col )

gets unique index of col

Parameters

col LP col

Definition at line 16914 of file lp.c.

References SCIP_Col::index, and NULL.

◆ SCIPcolGetVarProbindex()

SCIP_EXPORT int SCIPcolGetVarProbindex ( SCIP_COL * col )

gets probindex of corresponding variable

Parameters

col LP col

Definition at line 16924 of file lp.c.

References NULL, and SCIP_Col::var_probindex.

Referenced by addOrigRow(), and transformNonIntegralRow().

◆ SCIPcolIsIntegral()

SCIP_EXPORT SCIP_Bool SCIPcolIsIntegral ( SCIP_COL * col )

returns whether the associated variable is of integral type (binary, integer, implicit integer)

Parameters

col LP column

Definition at line 16934 of file lp.c.

References SCIP_Col::integral, NULL, SCIPvarIsIntegral(), and SCIP_Col::var.

Referenced by colIsDiscrete(), createSubscip(), generateClusterCuts(), generateDisjCutSOS1(), getGMIFromRow(), rowAddCoef(), rowCalcIdxsAndVals(), rowChgCoefPos(), rowMerge(), rowScale(), SCIPcolGetStrongbranch(), SCIPcolGetStrongbranches(), SCIPcolInvalidateStrongbranchData(), SCIPcolSetStrongbranchData(), SCIProwCalcIntegralScalar(), and transformNonIntegralRow().

◆ SCIPcolIsRemovable()

SCIP_EXPORT SCIP_Bool SCIPcolIsRemovable ( SCIP_COL * col )

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

Parameters

col LP column

Definition at line 16945 of file lp.c.

References NULL, and SCIP_Col::removable.

◆ SCIPcolGetLPPos()

SCIP_EXPORT int SCIPcolGetLPPos ( SCIP_COL * col )

gets position of column in current LP, or -1 if it is not in LP

Parameters

col LP column

Definition at line 16955 of file lp.c.

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

Referenced by addBdchg(), addFlowrowToCommodity(), cleanupNetwork(), collectIncidentFlowCols(), computeCut(), createCGCutCMIR(), createCGMIPprimalsols(), deleteCommodity(), extractCapacities(), extractCapacityRows(), extractNodes(), findUncapacitatedArcs(), generateAverageRay(), generateClusterCuts(), generateDisjCutSOS1(), getFlowrowFit(), getGMIFromRow(), getIncidentNodes(), getNodeSimilarityScore(), identifySourcesTargets(), initMatrix(), mcfnetworkExtract(), mcfnetworkFill(), modifyAndPackCut(), nodepairqueueCreate(), rowFindSlackVar(), SCIP_DECL_HEUREXEC(), SCIP_DECL_SEPAEXECLP(), and SCIPlpGetDualfarkas().

◆ 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

col LP column

Definition at line 16966 of file lp.c.

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

◆ SCIPcolIsInLP()

SCIP_EXPORT SCIP_Bool SCIPcolIsInLP ( SCIP_COL * col )

returns TRUE iff column is member of current LP

Parameters

col LP column

Definition at line 16977 of file lp.c.

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

Referenced by initLP(), SCIPgetVarsStrongbranchesFrac(), SCIPgetVarsStrongbranchesInt(), SCIPgetVarStrongbranchFrac(), SCIPgetVarStrongbranchInt(), SCIPgetVarStrongbranchWithPropagation(), SCIPlpGetDegeneracy(), SCIPpricestoreAddProbVars(), SCIPvarIsInLP(), and transformVariable().

◆ SCIPcolGetNNonz()

SCIP_EXPORT int SCIPcolGetNNonz ( SCIP_COL * col )

get number of nonzero entries in column vector

Parameters

col LP column

Definition at line 16988 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

col LP column

Definition at line 17002 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()

SCIP_EXPORT SCIP_ROW** SCIPcolGetRows ( SCIP_COL * col )

gets array with rows of nonzero entries

Parameters

col LP column

Definition at line 17013 of file lp.c.

References NULL, and SCIP_Col::rows.

Referenced by addFracCounter(), calcBranchScore(), calcShiftVal(), calculateBounds(), checkConstraintMatching(), createSubscip(), determineBound(), extractNodes(), getIncidentNodes(), getNActiveConsScore(), getNextFlowrow(), initMatrix(), relaxVar(), SCIP_DECL_HEUREXEC(), SCIPapplyLockFixings(), SCIPsolAdjustImplicitSolVals(), setupAggregationData(), shiftValues(), transformColumn(), tryFixVar(), updateActivities(), updateRowActivities(), updateSlacks(), varColCompare(), and varProcessBoundChanges().

◆ SCIPcolGetVals()

SCIP_EXPORT SCIP_Real* SCIPcolGetVals ( SCIP_COL * col )

gets array with coefficients of nonzero entries

Parameters

col LP column

Definition at line 17023 of file lp.c.

References NULL, and SCIP_Col::vals.

Referenced by calcBranchScore(), calcShiftVal(), calculateBounds(), createSubscip(), determineBound(), getIncidentNodes(), getNActiveConsScore(), initMatrix(), relaxVar(), SCIPapplyLockFixings(), SCIPsolAdjustImplicitSolVals(), setupAggregationData(), shiftValues(), transformColumn(), tryFixVar(), updateActivities(), updateRowActivities(), updateSlacks(), and varProcessBoundChanges().

◆ 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

col LP column

Definition at line 17035 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

col LP column

Definition at line 17045 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

col LP column

Definition at line 17055 of file lp.c.

References SCIP_Col::age, and NULL.

◆ SCIPboundtypeOpposite()

SCIP_EXPORT SCIP_BOUNDTYPE SCIPboundtypeOpposite ( SCIP_BOUNDTYPE boundtype )

gets opposite bound type of given bound type

Parameters

boundtype type of bound (lower or upper)

Definition at line 17065 of file lp.c.

References SCIP_BOUNDTYPE_LOWER, and SCIP_BOUNDTYPE_UPPER.

Referenced by analyzeConflict(), conflictAddConflictCons(), conflictCreateReconvergenceConss(), convertToActiveVar(), detectImpliedBounds(), SCIP_DECL_CONFLICTEXEC(), SCIP_DECL_CONSRESPROP(), SCIP_DECL_EVENTEXEC(), SCIPconflictAddBound(), and SCIPcreateConsBounddisjunction().

◆ 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

scip	SCIP data structure
col	LP 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:

SCIP_STAGE_SOLVING

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

scip	SCIP data structure
col	LP 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:

SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure
col	LP column

Definition at line 1148 of file scip_lp.c.

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

SCIP

Detailed Description

Functions

Function Documentation

◆ SCIPcolSort()

◆ SCIPcolGetObj()

◆ SCIPcolGetLb()

◆ SCIPcolGetUb()

◆ SCIPcolGetBestBound()

◆ SCIPcolGetPrimsol()

◆ SCIPcolGetMinPrimsol()

◆ SCIPcolGetMaxPrimsol()

◆ SCIPcolGetBasisStatus()

◆ SCIPcolGetVar()

◆ SCIPcolGetIndex()

◆ SCIPcolGetVarProbindex()

◆ SCIPcolIsIntegral()

◆ SCIPcolIsRemovable()

◆ SCIPcolGetLPPos()

◆ SCIPcolGetLPDepth()

◆ SCIPcolIsInLP()

◆ SCIPcolGetNNonz()

◆ SCIPcolGetNLPNonz()

◆ SCIPcolGetRows()

◆ SCIPcolGetVals()

◆ SCIPcolGetStrongbranchNode()

◆ SCIPcolGetNStrongbranchs()

◆ SCIPcolGetAge()

◆ SCIPboundtypeOpposite()

◆ SCIPgetColRedcost()

◆ SCIPgetColFarkasCoef()

◆ SCIPmarkColNotRemovableLocal()