Scippy

SCIP

Solving Constraint Integer Programs

Functions
cons_bounddisjunction.h File Reference
Constraint Handler

Detailed Description

constraint handler for bound disjunction constraints $(x_1 \{\leq,\geq\} b_1) \vee \ldots \vee (x_n \{\leq,\geq\} b_n)$

Author
Tobias Achterberg

This constraint handler handles bound disjunction constraints of the form

\[ (x_1 \{\leq,\geq\} b_1) \vee \ldots \vee (x_n \{\leq,\geq\} b_n) \]

with bounds $b_i \in Q$, decision variables $x_i$, which can be of any type, and bound types $\leq$ or $\geq$.

Definition in file cons_bounddisjunction.h.

#include "scip/scip.h"

Go to the source code of this file.

Functions

SCIP_RETCODE SCIPincludeConshdlrBounddisjunction (SCIP *scip)
 
SCIP_RETCODE SCIPcreateConsBounddisjunction (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_BOUNDTYPE *boundtypes, SCIP_Real *bounds, 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_RETCODE SCIPcreateConsBasicBounddisjunction (SCIP *scip, SCIP_CONS **cons, const char *name, int nvars, SCIP_VAR **vars, SCIP_BOUNDTYPE *boundtypes, SCIP_Real *bounds)
 
int SCIPgetNVarsBounddisjunction (SCIP *scip, SCIP_CONS *cons)
 
SCIP_VAR ** SCIPgetVarsBounddisjunction (SCIP *scip, SCIP_CONS *cons)
 
SCIP_BOUNDTYPE * SCIPgetBoundtypesBounddisjunction (SCIP *scip, SCIP_CONS *cons)
 
SCIP_Real * SCIPgetBoundsBounddisjunction (SCIP *scip, SCIP_CONS *cons)
 

Function Documentation

SCIP_RETCODE SCIPincludeConshdlrBounddisjunction ( SCIP *  scip)

creates the handler for bound disjunction constraints and includes it in SCIP

Parameters
scipSCIP data structure

Definition at line 2964 of file cons_bounddisjunction.c.

References CONFLICTHDLR_DESC, CONFLICTHDLR_NAME, CONFLICTHDLR_PRIORITY, CONSHDLR_CHECKPRIORITY, CONSHDLR_DELAYPRESOL, CONSHDLR_DELAYPROP, CONSHDLR_DESC, CONSHDLR_EAGERFREQ, CONSHDLR_ENFOPRIORITY, CONSHDLR_MAXPREROUNDS, CONSHDLR_NAME, CONSHDLR_NEEDSCONS, CONSHDLR_PROP_TIMING, CONSHDLR_PROPFREQ, conshdlrdataCreate(), DEFAULT_CONTINUOUSFRAC, EVENTHDLR_DESC, EVENTHDLR_NAME, FALSE, NULL, QUADCONSUPGD_PRIORITY, SCIP_CALL, SCIP_OKAY, SCIPaddRealParam(), SCIPallocMemory, SCIPfindConshdlr(), SCIPincludeConflicthdlrBasic(), SCIPincludeConshdlrBasic(), SCIPincludeEventhdlrBasic(), SCIPincludeQuadconsUpgrade(), SCIPsetConflicthdlrFree(), SCIPsetConshdlrActive(), SCIPsetConshdlrCopy(), SCIPsetConshdlrDeactive(), SCIPsetConshdlrDelete(), SCIPsetConshdlrExitpre(), SCIPsetConshdlrFree(), SCIPsetConshdlrGetNVars(), SCIPsetConshdlrGetVars(), SCIPsetConshdlrParse(), SCIPsetConshdlrPresol(), SCIPsetConshdlrPrint(), SCIPsetConshdlrProp(), SCIPsetConshdlrResprop(), SCIPsetConshdlrTrans(), and TRUE.

Referenced by SCIP_DECL_CONSHDLRCOPY(), and SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPcreateConsBounddisjunction ( SCIP *  scip,
SCIP_CONS **  cons,
const char *  name,
int  nvars,
SCIP_VAR **  vars,
SCIP_BOUNDTYPE *  boundtypes,
SCIP_Real *  bounds,
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 
)

creates and captures a bound disjunction constraint

Note
the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
Parameters
scipSCIP data structure
conspointer to hold the created constraint
namename of constraint
nvarsnumber of variables in the constraint
varsvariables of the literals in the constraint
boundtypestypes of bounds of the literals (lower or upper bounds)
boundsbounds of the literals
initialshould the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'.
separateshould the constraint be separated during LP processing? Usually set to TRUE.
enforceshould the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints.
checkshould the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints.
propagateshould the constraint be propagated during node processing? Usually set to TRUE.
localis constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints.
modifiableis constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint.
dynamicis constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are separated as constraints.
removableshould the relaxation be removed from the LP due to aging or cleanup? Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'.
stickingatnodeshould the constraint always be kept at the node where it was added, even if it may be moved to a more global node? Usually set to FALSE. Set to TRUE to for constraints that represent node data.

Definition at line 3035 of file cons_bounddisjunction.c.

References consdataCreate(), CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcreateCons(), SCIPerrorMessage, and SCIPfindConshdlr().

Referenced by adjustOversizedJobBounds(), createConflict(), CUTOFF_CONSTRAINT(), forbidFixation(), readBounds(), readSemicontinuous(), readVariables(), SCIP_DECL_CONFLICTEXEC(), SCIP_DECL_CONSCOPY(), SCIP_DECL_CONSPARSE(), SCIP_DECL_QUADCONSUPGD(), and SCIPcreateConsBasicBounddisjunction().

SCIP_RETCODE SCIPcreateConsBasicBounddisjunction ( SCIP *  scip,
SCIP_CONS **  cons,
const char *  name,
int  nvars,
SCIP_VAR **  vars,
SCIP_BOUNDTYPE *  boundtypes,
SCIP_Real *  bounds 
)

creates and captures an and constraint in its most basic version, i. e., all constraint flags are set to their basic value as explained for the method SCIPcreateConsBounddisjunction(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h

See Also
SCIPcreateConsBounddisjunction() for information about the basic constraint flag configuration
Note
the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
Parameters
scipSCIP data structure
conspointer to hold the created constraint
namename of constraint
nvarsnumber of variables in the constraint
varsvariables of the literals in the constraint
boundtypestypes of bounds of the literals (lower or upper bounds)
boundsbounds of the literals

Definition at line 3099 of file cons_bounddisjunction.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPcreateConsBounddisjunction(), and TRUE.

int SCIPgetNVarsBounddisjunction ( SCIP *  scip,
SCIP_CONS *  cons 
)

gets number of variables in bound disjunction constraint

Parameters
scipSCIP data structure
consconstraint data

Definition at line 3118 of file cons_bounddisjunction.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by checkBounddisjunction(), createCoveringProblem(), and SCIP_DECL_CONSCOPY().

SCIP_VAR** SCIPgetVarsBounddisjunction ( SCIP *  scip,
SCIP_CONS *  cons 
)

gets array of variables in bound disjunction constraint

Parameters
scipSCIP data structure
consconstraint data

Definition at line 3139 of file cons_bounddisjunction.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by checkBounddisjunction(), createCoveringProblem(), and SCIP_DECL_CONSCOPY().

SCIP_BOUNDTYPE* SCIPgetBoundtypesBounddisjunction ( SCIP *  scip,
SCIP_CONS *  cons 
)

gets array of bound types in bound disjunction constraint

Parameters
scipSCIP data structure
consconstraint data

Definition at line 3160 of file cons_bounddisjunction.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by checkBounddisjunction(), and SCIP_DECL_CONSCOPY().

SCIP_Real* SCIPgetBoundsBounddisjunction ( SCIP *  scip,
SCIP_CONS *  cons 
)

gets array of bounds in bound disjunction constraint

Parameters
scipSCIP data structure
consconstraint data

Definition at line 3181 of file cons_bounddisjunction.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by checkBounddisjunction(), and SCIP_DECL_CONSCOPY().