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XPRBgetnextqterm

XPRBgetnextqterm

Purpose
Get the next quadratic term of a constraint.
Synopsis
const void *XPRBgetnextqterm(XPRBctr ctr, const void *ref, XPRBvar *var1, XPRBvar *var2, double *coeff);
Arguments
ctr 
Constraint whose terms are to be enumerated.
ref 
Reference pointer or NULL.
var1 
BCL reference to a variable. May be NULL if not required.
var2 
BCL reference to a variable. May be NULL if not required.
coeff 
Coefficient associated to the quadratic term var1 * var2. May be NULL if not required.
Return value
Reference pointer for the next call to XPRBgetnextqterm or NULL if there are no more terms.
Example 
XPRBprob prob;
XPRBctr ctr;
XPRBvar var1, var2;
double coeff;
const void *ref;
   ...
ref = NULL;
while ((ref = XPRBgetnextqterm(ctr, ref, &var1, &var2, &coeff))
       != NULL) {
  XPRBprintf("Quadratic term %s * %s has coefficient %g\n",
    XPRBgetvarname(var1), XPRBgetvarname(var2), coeff);
}
This example prints all quadratic terms of a constraint.
Further information
This function can be used to enumerate the quadratic terms of a constraint. The second parameter serves to keep track of the current location inthe enumeration; if this parameter is NULL, the first term is returned. This function returns NULL if it is called with the reference to the last element. Otherwise, the returned value can be used as the input parameter ref to retrieve the following term of the same type.
Related topics
XPRBgetnextterm, XPRBaddqterm.

Parent Topic BCL C library functions

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