cons_knapsack.h File Reference

Detailed Description

Constraint handler for knapsack constraints of the form $a^T x \le b$, x binary and $a \ge 0$.

Author

Tobias Achterberg

Kati Wolter

Michael Winkler

Definition in file cons_knapsack.h.

#include "scip/def.h"
#include "scip/type_cons.h"
#include "scip/type_lp.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_sepa.h"
#include "scip/type_sol.h"
#include "scip/type_var.h"

Go to the source code of this file.

Functions
SCIP_EXPORT SCIP_RETCODE	SCIPincludeConshdlrKnapsack (SCIP *scip)
Knapsack Constraints
This constraint handler handles a special type of linear constraints, namely knapsack constraints. A knapsack constraint has the form $$\sum_{i=1}^n a_i x_i \leq b$$ with non-negative integer coefficients $a_i$, integer right-hand side $b$, and binary variables $x_i$.
SCIP_EXPORT SCIP_RETCODE	SCIPcreateConsKnapsack (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Longint *weights, SCIP_Longint capacity, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode)
SCIP_EXPORT SCIP_RETCODE	SCIPcreateConsBasicKnapsack (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_Longint *weights, SCIP_Longint capacity)
SCIP_EXPORT SCIP_RETCODE	SCIPaddCoefKnapsack (SCIP *scip, SCIP_CONS *cons, SCIP_VAR *var, SCIP_Longint weight)
SCIP_EXPORT SCIP_Longint	SCIPgetCapacityKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_RETCODE	SCIPchgCapacityKnapsack (SCIP *scip, SCIP_CONS *cons, SCIP_Longint capacity)
SCIP_EXPORT int	SCIPgetNVarsKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_VAR **	SCIPgetVarsKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_Longint *	SCIPgetWeightsKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_Real	SCIPgetDualsolKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_Real	SCIPgetDualfarkasKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_ROW *	SCIPgetRowKnapsack (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_RETCODE	SCIPsolveKnapsackExactly (SCIP *scip, int nitems, SCIP_Longint *weights, SCIP_Real *profits, SCIP_Longint capacity, int *items, int *solitems, int *nonsolitems, int *nsolitems, int *nnonsolitems, SCIP_Real *solval, SCIP_Bool *success)
SCIP_EXPORT SCIP_RETCODE	SCIPsolveKnapsackApproximately (SCIP *scip, int nitems, SCIP_Longint *weights, SCIP_Real *profits, SCIP_Longint capacity, int *items, int *solitems, int *nonsolitems, int *nsolitems, int *nnonsolitems, SCIP_Real *solval)
SCIP_EXPORT SCIP_RETCODE	SCIPseparateKnapsackCuts (SCIP *scip, SCIP_CONS *cons, SCIP_SEPA *sepa, SCIP_VAR **vars, int nvars, SCIP_Longint *weights, SCIP_Longint capacity, SCIP_SOL *sol, SCIP_Bool usegubs, SCIP_Bool *cutoff, int *ncuts)
SCIP_EXPORT SCIP_RETCODE	SCIPseparateRelaxedKnapsack (SCIP *scip, SCIP_CONS *cons, SCIP_SEPA *sepa, int nknapvars, SCIP_VAR **knapvars, SCIP_Real *knapvals, SCIP_Real valscale, SCIP_Real rhs, SCIP_SOL *sol, SCIP_Bool *cutoff, int *ncuts)
SCIP_EXPORT SCIP_RETCODE	SCIPcleanupConssKnapsack (SCIP *scip, SCIP_Bool onlychecked, SCIP_Bool *infeasible)