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Thanks Atharv .

I managed to run it down to 10 infeasible but I want to know how to use the iis . Can you help me with the code?

Thanks Atharv , that code worked. But I am facing another issue. I have defined two binary variables yR(r,z) and yB(b,u) to select one of the capacities out of 3 for RBPDs and bio-refineries respectively. (The values are mentioned in the parameter as well) parameters r_ub(z) /1 20000, 2 60000, 3 900...

The 0s represent that the farms cannot deliver to those locations because they are far (out of 85km in case of Dfr) . I have written it 0 so that transport cost gets calculated for the farms in that bound. Bfr represents the amount of biomass sent from farms to RBPD that gets calculated by GAMS itse...

I have the 443 farms(f) , 16 RBPDs (r) and 5 Biorefineries (b). The constraints I have for distance between each of these have been used in the table , they are as goes : Dfr<=85 21=<Drb<=255 Dfb<=85 However the farms sends biomass to RBPDs and biorefineries beyond their distance limit because I hav...