I am solving an assignment and scheduling problem which is MIP and calling OsiCbcSolverInterface? from flopCpp to solve it. The solver is throwing that 'The LP relaxation is infeasible and too expensive'. I like to know if there is any functionality in COIN cbc library to check which constraint or group of constraints are causing infeasibility and also how to deal with these infeasibility issues in COIN environment. I know this functinality is available in CPLEX where CPLEX allows users to remove IISs(Irreducible Infeasibility Sets) but could not find it in COIN. May be I am completely unaware that this functionality does exist in COIN but I am unable to locate it. So please help to resolve this.
Attachment(s): https://github.com/s-c-e/cbc-trac-migration-attachments/blob/master/trac-ticket-145.zip
Hi,
I am solving an assignment and scheduling problem which is MIP and calling OsiCbcSolverInterface? from flopCpp to solve it. The solver is throwing that 'The LP relaxation is infeasible and too expensive'. I like to know if there is any functionality in COIN cbc library to check which constraint or group of constraints are causing infeasibility and also how to deal with these infeasibility issues in COIN environment. I know this functinality is available in CPLEX where CPLEX allows users to remove IISs(Irreducible Infeasibility Sets) but could not find it in COIN. May be I am completely unaware that this functionality does exist in COIN but I am unable to locate it. So please help to resolve this.
Thanks, Rakesh