problem.iisall
problem.iisall |
Purpose
Performs an automated search for independent Irreducible Infeasible Sets (IIS) in an infeasible problem.
Synopsis
problem.iisall()
Example
This example searches for IISs and then questions the problem attribute
NUMIIS to determine how many were found:
p.iisall()
print("The problem has {0} IISs".format(p.attributes.numiis))
Further information
1. A model may have several infeasibilities. Repairing a single IIS may not make the model feasible. For this reason the Optimizer can find an IIS for each of the infeasibilities in a model. If the control
MAXIIS is set to a positive integer value then the
problem.iisall command will stop if
MAXIIS IISs have been found. By default the control
MAXIIS is set to
-1, in which case an IIS is found for each of the infeasibilities in the model.
2. The problem attribute
NUMIIS allows the user to recover the number of IISs found in a particular search. Alternatively, the
problem.iisstatus function may be used to retrieve the number of IISs found by the
problem.iisfirst,
problem.iisnext, or
problem.iisall functions.
Related topics
problem.getiisdata,
problem.iisclear,
problem.iisfirst,
problem.iisisolations,
problem.iisnext,
problem.iisstatus,
problem.iiswrite.