In my model, I have three kinds of decision variables, they are Y_l(n1,n2), X_z(zn), and belta(n1,n2);
When I define these variables as positive continuous variables and fix them as zero (Y_l.fx=0; X_z.fx=0, and belta.fx=0), I got a obvious solution with all variables being zero.
However, when I define these variables as binary variables and also fix them as zero, GAMS return integer infeasibility. This is weird because all variables with zero value must be a feasible solution.
Does anyone know what happened here?
Thank you all in advance.
Problems with modeling
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