GAMS World Forum

It is unclear why fixing a binary variable is needed.
A constraint such as n(i, j, t) =g= V(i, j, t) can ensure that when V(i, j, t) is 1, n(i, j, t) is 1.

It is difficult to answer this question without knowing about the rest of your model (how you would like to see the fuel of a particular plant change). In general, one would model binary variables to represent the type of fuel j used in plant i in the year j, and then use these binary variables in t...

When I try to run your model, I see the solution shifted to right from everywhere starting from s=1. i.e. k=1, s=1 is 0 and k=1, s=2 is 50. Therefore, this is probably an inconsistency in your definition but the solution you are getting matches with the one shown in the second table. Also, for k=3, ...

Take a look at the following: You can either use higher dimensional parameter. Syntax is provided in GAMS documentation https://www.gams.com/latest/docs/UG_DataEntry.html#UG_DataEntry_ParameterDataForHigherDimensions Or Higher dimensional tables. https://www.gams.com/latest/docs/UG_DataEntry.html#UG...

I assume you want to fix the initial inventory to a value. You can do this by H.fx(i, p, '1', s) = 0; Moreover, you may not even need two separate constraints if the only difference is initial inventory. You can model the first constraint as follows: H(i, p, t-1, s)$(ord(t) ne 1) + ..... This way th...