Purpose
Set a user callback to be called at the start of each SLP iteration
Synopsis
int XPRS_CC XSLPsetcbiterstart(XSLPprob Prob,
int (XPRS_CC *UserFunc) (XSLPprob myProb, void *myObject),
void *Object);
Arguments
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Prob
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The current SLP problem.
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UserFunc
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The function to be called at the start of each SLP iteration.
UserFunc returns an integer value.
If the return value is nonzero, the SLP iterations will stop.
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myProb
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The problem passed to the callback function.
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myObject
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The user-defined object passed as Object to
XSLPsetcbiterstart.
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Object
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Address of a user-defined object, which can be used for any purpose
by the function. Object is passed to UserFunc as myObject.
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Example
The following example sets up a callback to be executed at the start of the
optimization to save to save the values of the variables from the previous iteration:
double *cSol;
XSLPsetcbiterstart(Prob, CBIterStart, &cSol);
A suitable callback function might resemble this:
int XPRS_CC CBIterStart(XSLPprob MyProb, void *Obj) {
XPRSprob xprob;
double *cSol;
int nIter;
cSol = * (double **) Obj;
XSLPgetintattrib(MyProb, XSLP_ITER, &nIter);
if (nIter == 0) return 0; /* no previous solution */
XSLPgetptrattrib(MyProb, XSLP_XPRSPROBLEM, &xprob);
XPRSgetsol(xprob, cSol, NULL, NULL, NULL);
return 0;
}The Object 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 each SLP iteration before
the optimization begins.
When used with VB, the callback function has the prototype:
Public Function mycbfunc (ByVal prob As Long, ByVal object As Long) As Long
Related topics
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