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XPRSsetcbinfnode

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Purpose

Declares a user optimal node callback function, called after the current node has been found to be infeasible during the Branch and Bound search.

Synopsis

int XPRS_CC XPRSsetcbinfnode(XPRSprob prob, void (XPRS_CC *fuin)(XPRSprob my_prob, void *my_object), void *object);

Arguments

prob	The current problem
fuin	The callback function which takes two arguments, my_prob and my_object, and has no return value. This function is called after the current node has been found to be infeasible.
my_prob	The problem passed to the callback function, fuin.
my_object	The user-defined object passed as object when setting up the callback with XPRSsetcbinfnode.
object	A user-defined object to be passed to the callback function, fuin.

Related Controls

Integer

NODESELECTION

Node selection control.

Example

The following notifies the user whenever an infeasible node is found during the global search:

XPRSsetintcontrol(prob,XPRS_NODESELECTION,2);
XPRSsetcbinfnode(prob,nodeInfeasible,NULL);
XPRSmaxim(prob,"g");

The callback function may resemble:

void XPRS_CC nodeInfeasible(XPRSprob prob, void *obj)
{
  int node;
  XPRSgetintattrib(prob, XPRS_NODES, &node);
  printf("Node %d infeasible\n", node);
}

See the example depthfirst.c on the Xpress‑MP CD-ROM.

Related topics

XPRSsetcbchgnode, XPRSsetcboptnode, XPRSsetcbintsol, XPRSsetcbnodecutoff, XPRSsetcbchgbranch, XPRSsetcbprenode.

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