cons_linking.h File Reference

Detailed Description

constraint handler for linking binary variables to an integer variable

Author

Stefan Heinz

Jens Schulz

Definition in file cons_linking.h.

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

Go to the source code of this file.

Functions
SCIP_EXPORT SCIP_RETCODE	SCIPincludeConshdlrLinking (SCIP *scip)
Linking Constraints
The constraints handler stores linking constraints between an integer variable and an array of binary variables. Such a linking constraint has the form: \[ y = \sum_{i=1}^n {c_i * x_i} \] with integer variable \( y \), binary variables \( x_1, \dots, x_n \) and offset \(b \in Q\), and with the additional side condition that exactly one binary variable has to be one (set partitioning condition). This constraint can be created only with the integer variable. In this case the binary variables are only created on demand. That is, whenever someone asks for the binary variables. Therefore, such constraints can be used to get a "binary representation" of the domain of the integer variable which will be dynamically created.
SCIP_EXPORT SCIP_RETCODE	SCIPcreateConsLinking (SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR *intvar, SCIP_VAR **binvars, int *vals, int nbinvars, 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	SCIPcreateConsBasicLinking (SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR *intvar, SCIP_VAR **binvars, int *vals, int nbinvars)
SCIP_EXPORT SCIP_Bool	SCIPexistsConsLinking (SCIP *scip, SCIP_VAR *intvar)
SCIP_EXPORT SCIP_CONS *	SCIPgetConsLinking (SCIP *scip, SCIP_VAR *intvar)
SCIP_EXPORT SCIP_VAR *	SCIPgetIntvarLinking (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT SCIP_RETCODE	SCIPgetBinvarsLinking (SCIP *scip, SCIP_CONS *cons, SCIP_VAR ***binvars, int *nbinvars)
SCIP_EXPORT int	SCIPgetNBinvarsLinking (SCIP *scip, SCIP_CONS *cons)
SCIP_EXPORT int *	SCIPgetValsLinking (SCIP *scip, SCIP_CONS *cons)