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constraint handler for pseudoboolean constraints
- Author
- Stefan Heinz
-
Michael Winkler
The constraint handler deals with pseudo boolean constraints. These are constraints of the form
![\[ \mbox{lhs} \leq \sum_{k=0}^m c_k \cdot x_k + \sum_{i=0}^n c_i \cdot \prod_{j \in I_i} x_j \leq \mbox{rhs} \]](form_107.png)
where all  are binary and all  are integer.
Definition in file cons_pseudoboolean.h.
Go to the source code of this file.
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| SCIP_RETCODE | SCIPincludeConshdlrPseudoboolean (SCIP *scip) |
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| SCIP_RETCODE | SCIPcreateConsPseudobooleanWithConss (SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_CONS *lincons, SCIP_LINEARCONSTYPE linconstype, SCIP_CONS **andconss, SCIP_Real *andcoefs, int nandconss, SCIP_VAR *indvar, SCIP_Real weight, SCIP_Bool issoftcons, SCIP_VAR *intvar, SCIP_Real lhs, SCIP_Real rhs, 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) |
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| SCIP_RETCODE | SCIPcreateConsPseudoboolean (SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR **linvars, int nlinvars, SCIP_Real *linvals, SCIP_VAR ***terms, int nterms, int *ntermvars, SCIP_Real *termvals, SCIP_VAR *indvar, SCIP_Real weight, SCIP_Bool issoftcons, SCIP_VAR *intvar, SCIP_Real lhs, SCIP_Real rhs, 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) |
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| SCIP_RETCODE | SCIPcreateConsBasicPseudoboolean (SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR **linvars, int nlinvars, SCIP_Real *linvals, SCIP_VAR ***terms, int nterms, int *ntermvars, SCIP_Real *termvals, SCIP_VAR *indvar, SCIP_Real weight, SCIP_Bool issoftcons, SCIP_VAR *intvar, SCIP_Real lhs, SCIP_Real rhs) |
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| SCIP_RETCODE | SCIPaddCoefPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_VAR *const var, SCIP_Real const val) |
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| SCIP_RETCODE | SCIPaddTermPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_VAR **const vars, int const nvars, SCIP_Real const val) |
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| SCIP_VAR * | SCIPgetIndVarPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| SCIP_CONS * | SCIPgetLinearConsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| SCIP_LINEARCONSTYPE | SCIPgetLinearConsTypePseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| int | SCIPgetNLinVarsWithoutAndPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| SCIP_RETCODE | SCIPgetLinDatasWithoutAndPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_VAR **const linvars, SCIP_Real *const lincoefs, int *const nlinvars) |
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| SCIP_RETCODE | SCIPgetAndDatasPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_CONS **const andconss, SCIP_Real *const andcoefs, int *const nandconss) |
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| int | SCIPgetNAndsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| SCIP_RETCODE | SCIPchgLhsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_Real const lhs) |
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| SCIP_RETCODE | SCIPchgRhsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons, SCIP_Real const rhs) |
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| SCIP_Real | SCIPgetLhsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| SCIP_Real | SCIPgetRhsPseudoboolean (SCIP *const scip, SCIP_CONS *const cons) |
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| #define ARTIFICIALVARNAMEPREFIX "andresultant_" |
solution status after solving LP
| Enumerator |
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| SCIP_LINEARCONSTYPE_INVALIDCONS |
this is no valid linear constraint type
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| SCIP_LINEARCONSTYPE_LINEAR |
this is the common linear constraint
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| SCIP_LINEARCONSTYPE_LOGICOR |
this is a logicor constraint
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| SCIP_LINEARCONSTYPE_KNAPSACK |
this is a knapsack constraint
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| SCIP_LINEARCONSTYPE_SETPPC |
this is a setppc constraint
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Definition at line 45 of file cons_pseudoboolean.h.
creates the handler for pseudoboolean constraints and includes it in SCIP
- Parameters
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| SCIP_RETCODE SCIPcreateConsPseudobooleanWithConss |
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SCIP * |
scip, |
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SCIP_CONS ** |
cons, |
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const char * |
name, |
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SCIP_CONS * |
lincons, |
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SCIP_LINEARCONSTYPE |
linconstype, |
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SCIP_CONS ** |
andconss, |
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SCIP_Real * |
andcoefs, |
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int |
nandconss, |
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SCIP_VAR * |
indvar, |
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SCIP_Real |
weight, |
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SCIP_Bool |
issoftcons, |
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SCIP_VAR * |
intvar, |
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SCIP_Real |
lhs, |
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SCIP_Real |
rhs, |
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SCIP_Bool |
initial, |
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SCIP_Bool |
separate, |
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SCIP_Bool |
enforce, |
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SCIP_Bool |
check, |
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SCIP_Bool |
propagate, |
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SCIP_Bool |
local, |
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SCIP_Bool |
modifiable, |
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SCIP_Bool |
dynamic, |
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SCIP_Bool |
removable, |
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SCIP_Bool |
stickingatnode |
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) |
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creates and captures a pseudoboolean constraint, with given linear and and-constraints
- Parameters
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| scip | SCIP data structure |
| cons | pointer to hold the created constraint |
| name | name of constraint |
| lincons | associated linear constraint |
| linconstype | linear constraint type of associated linear constraint |
| andconss | associated and-constraints |
| andcoefs | associated coefficients of and-constraints |
| nandconss | number of associated and-constraints |
| indvar | indicator variable if it's a soft constraint, or NULL |
| weight | weight of the soft constraint, if it is one |
| issoftcons | is this a soft constraint |
| intvar | a artificial variable which was added only for the objective function, if this variable is not NULL this constraint (without this integer variable) describes the objective funktion |
| lhs | left hand side of constraint |
| rhs | right hand side of constraint |
| initial | should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'. |
| separate | should the constraint be separated during LP processing? Usually set to TRUE. |
| enforce | should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints. |
| check | should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints. |
| propagate | should the constraint be propagated during node processing? Usually set to TRUE. |
| local | is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints. |
| modifiable | is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint. |
| dynamic | is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are seperated as constraints. |
| removable | should 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'. |
| stickingatnode | should 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. |
| SCIP_RETCODE SCIPcreateConsPseudoboolean |
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SCIP * |
scip, |
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SCIP_CONS ** |
cons, |
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const char * |
name, |
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SCIP_VAR ** |
linvars, |
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int |
nlinvars, |
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SCIP_Real * |
linvals, |
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SCIP_VAR *** |
terms, |
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int |
nterms, |
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int * |
ntermvars, |
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SCIP_Real * |
termvals, |
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SCIP_VAR * |
indvar, |
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SCIP_Real |
weight, |
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SCIP_Bool |
issoftcons, |
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SCIP_VAR * |
intvar, |
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SCIP_Real |
lhs, |
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SCIP_Real |
rhs, |
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SCIP_Bool |
initial, |
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SCIP_Bool |
separate, |
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SCIP_Bool |
enforce, |
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SCIP_Bool |
check, |
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SCIP_Bool |
propagate, |
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SCIP_Bool |
local, |
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SCIP_Bool |
modifiable, |
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SCIP_Bool |
dynamic, |
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SCIP_Bool |
removable, |
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SCIP_Bool |
stickingatnode |
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) |
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creates and captures a pseudoboolean constraint
- Note
- linear and nonlinear terms can be added using SCIPaddCoefPseudoboolean() and SCIPaddTermPseudoboolean(), respectively
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the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
- Parameters
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| scip | SCIP data structure |
| cons | pointer to hold the created constraint |
| name | name of constraint |
| linvars | variables of the linear part, or NULL |
| nlinvars | number of variables of the linear part |
| linvals | coefficients of linear part, or NULL |
| terms | nonlinear terms of variables, or NULL |
| nterms | number of terms of variables of nonlinear term |
| ntermvars | number of variables in nonlinear terms, or NULL |
| termvals | coefficients of nonlinear parts, or NULL |
| indvar | indicator variable if it's a soft constraint, or NULL |
| weight | weight of the soft constraint, if it is one |
| issoftcons | is this a soft constraint |
| intvar | a artificial variable which was added only for the objective function, if this variable is not NULL this constraint (without this integer variable) describes the objective function |
| lhs | left hand side of constraint |
| rhs | right hand side of constraint |
| initial | should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'. |
| separate | should the constraint be separated during LP processing? Usually set to TRUE. |
| enforce | should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints. |
| check | should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints. |
| propagate | should the constraint be propagated during node processing? Usually set to TRUE. |
| local | is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints. |
| modifiable | is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint. |
| dynamic | is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are separated as constraints. |
| removable | should 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'. |
| stickingatnode | should 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. |
| SCIP_RETCODE SCIPcreateConsBasicPseudoboolean |
( |
SCIP * |
scip, |
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SCIP_CONS ** |
cons, |
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const char * |
name, |
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SCIP_VAR ** |
linvars, |
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int |
nlinvars, |
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SCIP_Real * |
linvals, |
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SCIP_VAR *** |
terms, |
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int |
nterms, |
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int * |
ntermvars, |
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SCIP_Real * |
termvals, |
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SCIP_VAR * |
indvar, |
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SCIP_Real |
weight, |
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SCIP_Bool |
issoftcons, |
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SCIP_VAR * |
intvar, |
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SCIP_Real |
lhs, |
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SCIP_Real |
rhs |
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) |
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creates and captures a pseudoboolean constraint in its most basic variant, i. e., with all constraint flags set to their default values, which can be set afterwards using SCIPsetConsFLAGNAME() in scip.h
- See Also
- SCIPcreateConsPseudoboolean() for the default constraint flag configuration
- Note
- the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
- Parameters
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| scip | SCIP data structure |
| cons | pointer to hold the created constraint |
| name | name of constraint |
| linvars | variables of the linear part, or NULL |
| nlinvars | number of variables of the linear part |
| linvals | coefficients of linear part, or NULL |
| terms | nonlinear terms of variables, or NULL |
| nterms | number of terms of variables of nonlinear term |
| ntermvars | number of variables in nonlinear terms, or NULL |
| termvals | coefficients of nonlinear parts, or NULL |
| indvar | indicator variable if it's a soft constraint, or NULL |
| weight | weight of the soft constraint, if it is one |
| issoftcons | is this a soft constraint |
| intvar | a artificial variable which was added only for the objective function, if this variable is not NULL this constraint (without this integer variable) describes the objective function |
| lhs | left hand side of constraint |
| rhs | right hand side of constraint |
adds linear term pseudo boolean constraint (if it is not zero)
- Note
- you can only add a coefficient if the special type of linear constraint won't changed
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| var | variable of constraint entry |
| val | coefficient of constraint entry |
adds nonlinear term to pseudo boolean constraint (if it is not zero)
- Note
- you can only add a coefficient if the special type of linear constraint won't changed
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| vars | variables of the nonlinear term |
| nvars | number of variables of the nonlinear term |
| val | coefficient of constraint entry |
gets indicator variable of pseudoboolean constraint, or NULL if there is no
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
gets linear constraint of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
gets type of linear constraint of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| int SCIPgetNLinVarsWithoutAndPseudoboolean |
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SCIP *const |
scip, |
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SCIP_CONS *const |
cons |
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) |
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gets number of linear variables without artificial terms variables of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
gets linear constraint of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| linvars | array to store and-constraints |
| lincoefs | array to store and-coefficients |
| nlinvars | pointer to store the required array size for and-constraints, have to be initialized with size of given array |
gets and-constraints of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| andconss | array to store and-constraints |
| andcoefs | array to store and-coefficients |
| nandconss | pointer to store the required array size for and-constraints, have to be initialized with size of given array |
| int SCIPgetNAndsPseudoboolean |
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SCIP *const |
scip, |
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SCIP_CONS *const |
cons |
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) |
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gets number of and constraints of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
changes left hand side of pseudoboolean constraint
- Note
- you can only change the left hand side if the special type of linear constraint won't changed
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| lhs | new left hand side |
changes right hand side of pseudoboolean constraint
- Note
- you can only change the right hand side if the special type of linear constraint won't changed
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
| rhs | new right hand side |
get left hand side of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
get right hand side of pseudoboolean constraint
- Parameters
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| scip | SCIP data structure |
| cons | pseudoboolean constraint |
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