Initializing help system before first use

XSLPsetcbcascadestart, XPRSsetcbslpcascadestart

Purpose
Set a user callback to be called at the start of the cascading process, before any variables have been cascaded
Topic areas
Callback, SLP, Cascading
Synopsis
int XPRS_CC XSLPsetcbcascadestart(XSLPprob prob, int (XPRS_CC *cascadestart) (XSLPprob cbprob, void *cbdata), void *data);
Arguments
prob 
The current SLP problem.
cascadestart 
The function to be called at the start of the cascading process. cascadestart returns an integer value. If the return value is nonzero, the cascading process will be omitted for the current SLP iteration, but the optimization will continue.
cbprob 
The problem passed to the callback function.
cbdata 
The user-defined object passed as data to XSLPsetcbcascadestart.
data 
Address of a user-defined object, which can be used for any purpose by the function. data is passed to cascadestart as cbdata.
Example
The following example sets up a callback to be executed at the start of the cascading process to save the current values of the variables: 
double *cSol;
XSLPsetcbcascadestart(prob, CBCascStart, &cSol);
A suitable callback function might resemble this: 
int XPRS_CC CBCascStart(XSLPprob MyProb, void *Obj) {
  int iCol, nCol;
  double *cSol;
  cSol = * (double **) Obj;
  XSLPgetintcontrol(MyProb, XPRS_COLS, &nCol);
  for (iCol=0;iCol<nCol;iCol++) {
    XSLPgetvar(MyProb, iCol, NULL, NULL, NULL,
               NULL, NULL, NULL, &cSol[iCol],
               NULL, NULL, NULL, NULL,
               NULL, NULL, NULL, NULL);
  }
  return 0;
}
The data argument is used here to hold the address of the array cSol which we populate with the solution values.
Further information
This callback can be used at the start of the cascading, before any of the solution values have been recalculated.
Related topics
XSLPcascade, XSLPsetcbcascadeend, XSLPsetcbcascadevar, XSLPsetcbcascadevarfail

Parent Topic Library functions

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