Infeasibilities in CPLEX

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Luca
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Infeasibilities in CPLEX

Post by Luca » 6 months ago

Dear all,

I am programming in GAMS using CPLEX as MIP solver. I activated the following options for CPLEX

feasopt 1
numericalemphasis 1
scaind 1

CPLEX should provide the "less infeasible" solution to the problem. However I obtain the following error:

Feasible solution.
----------------------------------------------------------
Cplex reported an infeasible model, but no infeasibilities
larger than the feasibility tolerance: 0.01
could be found.
----------------------------------------------------------

Thanks in advance for all your help.
Best regards,
Luca

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bussieck
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Re: Infeasibilities in CPLEX

Post by bussieck » 6 months ago

Some models are on the edge of feasiblity/infeasibility. Often this goes together with poor scaling. The IBM Cplex folks have a video about dealing with infeasibility in general but also a section about these special models: https://developer.ibm.com/docloud/blog/ ... asibility/

Perhaps this helps.

-Michael

Luca
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Re: Infeasibilities in CPLEX

Post by Luca » 6 months ago

Thanks very much for your help!

Luca

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