XPRSaddcbestimate
XPRSaddcbestimate |
int XPRS_CC XPRSaddcbestimate(XPRSprob prob, int (XPRS_CC *f_estimate)(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, int priority);
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prob
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The current problem.
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f_estimate
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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.
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my_prob
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The problem passed to the callback function,
f_estimate.
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my_object
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The user-defined object passed as
object when setting up the callback with
XPRSaddcbestimate.
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iglsel
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Selected user global entity. Must be non-negative or -1 to indicate that there is no user global entity candidate for branching. If set to -1, all other arguments, except for
nglinf and
degsum are ignored. This argument is initialized to -1.
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iprio
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Priority of selected user global entity. This argument is initialized to a value larger (i.e., lower priority) than the default priority for global entities (see Section
Variable Selection for Branching in Section
Branch and Bound).
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degbest
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Estimated degradation from branching on selected user entity in preferred direction.
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degworst
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Estimated degradation from branching on selected user entity in worst direction.
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curval
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Current value of user global entities.
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ifupx
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Preferred branch on user global entity (
0,...,
nbr-1).
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nglinf
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Number of infeasible user global entities.
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degsum
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Sum of estimated degradations of satisfying all user entities.
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nbr
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Number of branches. The user separate routine (set up with
XPRSaddcbsepnode) will be called
nbr times in order to create the actual branches.
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object
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A user-defined object to be passed to the callback function,
f_estimate.
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priority
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An integer that determines the order in which multiple estimate callbacks will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
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