I need help on Lingo programming. I have a mixed integer programming to solve it using sets in Lingo. One of the constraints is :
S(i,k,w)>=m(i,j)*X(i,t) , for i=1,...,I ; j=1,...,J; t=1,..,T;
k=t+K(j,w)-1,..,t+K(j,w)+S(j)-2 ; w=1,..,W.
Here m(i,j), K(j,w) and S(j) are parameters.
The problem is i do not know how to enter index k using sets in Lingo.
Any help would be highly appreciated.
Use GAMS brother MUSA, it is easier to use and more powerful I beleive
See my papers that explain the LINGO model from RG.
LINGO is most easy among MP-solver.
It supports the natural explanation, SET explanation.
You check sample program using set explanation.
I will publise the book from Springer. I explain how to make many models.
But, if you can understand my Japanese book, I introduce many models of DEA, TSP, Portfolio, Product mix etc using Set explanations.
Dear Musa,
1-Define sets and attributes (variables and/ parameters
2-Write the objective function and constraints with the variables and parameters with index. For exammple, @for P(i) @for Q(j) @for B(k) @E(t) S(i,k,w)>=m(i,j)*X(i,t);
Notice that LINGO is not case sensetive so, be careful not to repeat vars and params names.
Best
Hi, Imran and Farah
Before questions, you must read the Linus textbook that is free from LINO HP.
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