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XPRSaddcbslpcascadeend

Purpose
Add a user callback to be called at the end of the cascading process, after the last variable has been cascaded
Topic areas
Callback, SLP, Cascading
Synopsis
int XPRS_CC XPRSaddcbslpcascadeend(XPRSprob prob, int (XPRS_CC *slpcascadeend) (XPRSprob cbprob, void *cbdata), void *data, int priority);
Arguments
prob 
The current problem.
slpcascadeend 
The function to be called at the end of the cascading process. slpcascadeend returns an integer value. If the return value is nonzero, the SLP iterations will stop.
cbprob 
The problem passed to the callback function.
cbdata 
The user-defined object passed as data to XPRSaddcbslpcascadeend.
data 
Address of a user-defined object, which can be used for any purpose by the function. data is passed to slpcascadeend as cbdata.
priority 
An integer that determines the order in which callbacks of this type 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.
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;
XPRSaddcbslpcascadeend(prob, CBCascEnd, &cSol, 0);
A suitable callback function might resemble this: 
int XPRS_CC CBCascEnd(XPRSprob MyProb, void *Obj) {
  int iCol, nCol;
  double *cSol, Value;
  cSol = * (double **) Obj;
  XPRSgetintcontrol(MyProb, XPRS_COLS, &nCol);
  for (iCol=0;iCol<nCol;iCol++) {
    XPRSalltype alltype;
    XPRSslpgetcolinfo(prob, XSLP_COLINFO_VALUE, iCol, &alltype);
    Value = alltype.value.real;
    if (fabs(Value-cSol[iCol]) > .01)
      printf("\nCol %d changed from %lg to %lg",
             iCol, cSol[iCol], Value);
  }
  return 0;
}
The data 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
XPRSslpcascade, XPRSaddcbslpcascadestart, XPRSaddcbslpcascadevar, XPRSaddcbslpcascadevarfail XPRSremovecbslpcascadeend

Parent Topic Library functions

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