I have a question and i would be appreciate if you can help me:

assume that I have 30 different sets in my model but I am not gonna use all of them. Depend on the value of one of the variables some of the sets must be use in constraints. I decided to use if-elseif+alias to solve my problem, but I dont know is that correct or which part of the program shall I write this code:

sets

g1 /1/

g2 /2/

g3 /3/

g4 /4/

g5 /5/

g6 /6/

g7 /7/

g8 /8/

g9 /9/

g10 /10/;

if (y1=1 and y2=1 and y3=1,

alias(g1,L1) and alias(g2,L2);

Elseif y1=1 and y2=1 and y4=1,

alias(g1,L1) and alias(g3,L2);

Elseif y1=1 and y4=1and y5=1,

alias(g3,L1) and alias(g6,L2));

Equation

const1(i)

const2(i);

const1(i)$L1… v(i)=g=epsilon;

const2(i)$L2… v(i)=g=0;

the If-elseif is longer than what I wrote and also i have much more constraints, I just wanna know this form of writing is correct?

I am new in gams and this is the first code I am going to write.

Thanks is advance.

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