XPRSsetcbestimate

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XPRSsetcbestimate

Purpose

Declares an estimate callback function. If defined, it will be called at each node of the branch and bound tree to determine the estimated degradation from branching the user's global entities.

Synopsis

int XPRS_CC XPRSsetcbestimate(XPRSprob prob, int (XPRS_CC *fbe)(XPRSprob my_prob, void *my_object, int *iglsel, int *iprio, double *degbest, double *degworst, double *curval, int *ifupx, int *nglinf, double *degsum, int *nbr), void *object);

Arguments

prob

The current problem.

fbe

The callback function which takes eleven arguments, my_prob, my_object, iglsel, iprio, degbest, degworst, curval, ifupx, nglinf, degsum and nbr, and has an integer return value. This function is called at each node of the Branch and Bound search.

my_prob

The problem passed to the callback function, fbe.

my_object

The user-defined object passed as object when setting up the callback with XPRSsetcbestimate.

iglsel

Selected user global entity (must be non-negative).

iprio

Priority of selected user global entity.

degbest

Estimated degradation from branching on selected user entity in preferred direction.

degworst

Estimated degradation from branching on selected user entity in worst direction.

curval

Current value of user global entities.

ifupx

Preferred branch on user global entity (0,...,nbr-1).

nglinf

Number of infeasible user global entities.

degsum

Sum of estimated degradations of satisfying all user entities.

nbr

Number of branches.

object

A user-defined object to be passed to the callback function, fbe.

Related topics

XPRSsetbranchcuts, XPRSsetcbsepnode, XPRSstorecuts.

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prob	The current problem.
fbe	The callback function which takes eleven arguments, my_prob, my_object, iglsel, iprio, degbest, degworst, curval, ifupx, nglinf, degsum and nbr, and has an integer return value. This function is called at each node of the Branch and Bound search.
my_prob	The problem passed to the callback function, fbe.
my_object	The user-defined object passed as object when setting up the callback with XPRSsetcbestimate.
iglsel	Selected user global entity (must be non-negative).
iprio	Priority of selected user global entity.
degbest	Estimated degradation from branching on selected user entity in preferred direction.
degworst	Estimated degradation from branching on selected user entity in worst direction.
curval	Current value of user global entities.
ifupx	Preferred branch on user global entity (0,...,nbr-1).
nglinf	Number of infeasible user global entities.
degsum	Sum of estimated degradations of satisfying all user entities.
nbr	Number of branches.
object	A user-defined object to be passed to the callback function, fbe.