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XSLPsetcbcascadeend

XSLPsetcbcascadeend

Purpose
Set a user callback to be called at the end of the cascading process, after the last variable has been cascaded
Synopsis
int XPRS_CC XSLPsetcbcascadeend(XSLPprob Prob, int (XPRS_CC *UserFunc) (XSLPprob myProb, void *myObject), void *Object);
Arguments
Prob 
The current SLP problem.
UserFunc 
The function to be called at the end of the cascading process. UserFunc returns an integer value. The return value is noted by Xpress-SLP but it has no effect on the optimization.
myProb 
The problem passed to the callback function.
myObject 
The user-defined object passed as Object to XSLPsetcbcascadeend.
Object 
Address of a user-defined object, which can be used for any purpose by the function. Object is passed to UserFunc as myObject.
Example
The following example sets up a callback to be executed at the end of the cascading process which checks if any of the values have been changed significantly: 
double *cSol;
XSLPsetcbcascadeend(Prob, CBCascEnd, &cSol);
A suitable callback function might resemble this: 
int XPRS_CC CBCascEnd(XSLPprob MyProb, void *Obj) {
  int iCol, nCol;
  double *cSol, Value;
  cSol = * (double **) Obj;
  XSLPgetintcontrol(MyProb, XPRS_COLS, &nCol);
  for (iCol=0;iCol<nCol;iCol++) {
    XSLPgetvar(MyProb, iCol, NULL, NULL, NULL,
               NULL, NULL, NULL, &Value,
               NULL, NULL, NULL, NULL,
               NULL, NULL, NULL, NULL);
    if (fabs(Value-cSol[iCol]) > .01)
      printf("\nCol %d changed from %lg to %lg",
             iCol, cSol[iCol], Value);
  }
  return 0;
}
The Object argument is used here to hold the address of the array cSol which we assume has been populated with the original solution values.
Further information
This callback can be used at the end of the cascading, when all the solution values have been recalculated.
Related topics
XSLPcascade, XSLPsetcbcascadestart, XSLPsetcbcascadevar, XSLPsetcbcascadevarfail

Parent Topic Library functions

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