Hi,
I am new to GAMS world and I am trying to solve a MIP maximization Problem. However, I am stuck on the following thing for weeks now:
I have a 2D table X(i,j) (say i = 3 and j = 5)
Variables:
a) y _- i.e. 3 elements
b) z[j] - i.e. 5 elements // Binary variable
Now, I want to add an equation saying that each element of y should be <= maximum value in each row of X(i,j)*z(j)
When I try to add an equation as:
coverage … smax((j), X(i,j)*z(j)) =g= y(i); // i.e. multiply each element (i,j) of X with j’th element of z and then find max along rows
I get the following error:
coverage … smax((j), X(i,j)*z(j)) =g= y(i);
**** $149 $149
149 Uncontrolled set entered as constant
Does anybody have an idea as to how I can model this constraint.
Initially, I had tried to use GLPK for solving this but hit the same roadblock.
Any help would be greatly appreciated.
Thanks,
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