Hello all,
I have difficulties in solving my problem. Can someone help me with GAMS Error 148

Error Messages
148 Dimension different - The symbol is referenced with more/less
indices as declared
257 Solve statement not checked because of previous errors

Hi
You are trying to find the minimum of the variable ETA which is defined over the set i using an optimization approach.
In your case, you could just find the minimum of sum(t,p_pvf(i,t)*c_pv(i)):

In your formulation you have a i objective functions: you are trying to minimize each ETA instead of looking for the minimum of all ETA. Multi-
(take a look at https://en.wikipedia.org/wiki/Mathematical_optimization#Multi-objective_optimization).
If you want to write an optimization problem, you have to write one objective function maximizing or minimizing one variable.
Cheers
Renger

Hi Renger,
Thanks for your answer.
In my purpose, I exactly want to minimize each ETA (ETA(1), ETA(2), ETA(3)) because I want to utilize some distributed algorithm. And p_pvf(i,t) is a variable in my future formulation.
Could you give me some advice to write it under the rule “write one objective function maximizing or minimizing one variable”?
Thank you!
Li