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XPRBgetnumiis

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Purpose

Get the number of independent IIS in an infeasible LP problem.

Synopsis

int XPRBgetnumiis(XPRBprob prob);

Argument

prob	Reference to a problem.

Return value

Number of independent IIS found by Xpress-Optimizer, or a negative value in case of error.

Example

The following gets the number of IIS for a problem.

XPRBprob expl2;
int num;
expl2 = XPRBnewprob("example2");
   ...
XPRBsolve(expl2, "");
if(XPRBgetlpstat(expl2)==XPRB_LP_INFEAS)
 num = XPRBgetnumiis(expl2);

Further information

This function returns the number of independent IIS (irreducible infeasible sets) of an infeasible LP problem. After retrieving the number of IIS, the variables and constraints in each set can be obtained with function XPRBgetiis.

Related topics

XPRBgetiis, XPRBgetlpstat.

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