Purpose
Continues the search for further Irreducible Infeasible Sets (IIS), or calls
XPRSiisfirst (
IIS) if no IIS has been identified yet.
Topic area
Synopsis
int XPRS_CC XPRSiisnext(XPRSprob prob, int *p_status);
Arguments
|
prob
|
The current problem.
|
|
p_status
|
The status after the search:
|
0
|
success;
|
|
1
|
no more IIS could be found, or problem is feasible if no
XPRSiisfirst call preceded;
|
|
2
|
on error (when the function returns nonzero).
|
|
Example
This looks for a further IIS.
XPRSiisnext(prob,&status);
Further information
1. Returning multiple IISs is supported only for linear problems.
2. Calling
IIS
-n from the console has the same effect as this function.
3. A model may have several infeasibilities. Repairing a single IIS may not make the model feasible. For this reason the Optimizer attempts to find an IIS for each of the infeasibilities in a model. You may call the
XPRSiisnext function repeatedly, or use the
XPRSiisall (
IIS
-a) function to retrieve all IIS at once.
4. This function is not affected by the control
MAXIIS.
5. If the problem has been modified since the last call to
XPRSiisfirst or
XPRSiisnext, the generation process has to be started from scratch.
Related topics
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