Hi there,

I want to extract and display the relative optimality gap of the solution found by the solver in GAMS after the solve statement. How do I do that

Note that this is different from specifying optcr before the solve statement

After the solve you have access to `modelname.objest`

(dual bound) and the objective value `modelname.objval`

now you can calculate the relative gap yourself using your favorite formula. Note that different solvers use different formulas to determine the gap: https://www.gams.com/latest/docs/UG_GamsCall.html#GAMSAOoptcr

Hope this helps,

-Michael