solver:providing_additional_debugging_information_if_a_model_is_integer_infeasible
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| - | ====== Providing additional debugging information, if a model is integer infeasible ====== | ||
| - | Q: //Is there any way to trace the infeasiblility cause by which equations/constraints ( with =e=, =l= or =g= ), which set by the user, from GAMS when the modelstate = 10, ie 'No feasible integer solution could be found', has occurred? // | ||
| - | Most MIP solver do not return a solution at all, if a problem is integer infeasible. If you check the lst file, you will see a messages like: | ||
| - | <code> | ||
| - | RESOURCE USAGE, LIMIT 0.014 1000.000 | ||
| - | ITERATION COUNT, LIMIT 0 10000 | ||
| - | |||
| - | ILOG CPLEX May 1, 2008 22.7.2 WIN 4792.4799 VIS x86/MS Windows | ||
| - | Cplex 11.0.1, GAMS Link 34 | ||
| - | |||
| - | Problem is integer infeasible. | ||
| - | |||
| - | No solution returned | ||
| - | </code> | ||
| - | Thus it is not possible for GAMS to provide any further information about the origin of the integer infeasibility. If you have a GAMS/Cplex license, you may want to have a look at "Feasible Relaxation", which may provide further information. For more details please consult the GAMS/CPLEX solver manual. | ||
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