Search found 5 matches

by stef
9 months ago
Forum: Syntax
Topic: Error in the constraint writing
Replies: 8
Views: 1076

Re: Error in the constraint writing

Hi Renger,
i write all the constraint and i don't have any problems. Thank you very much for your precious help.
Cheers, Stef.
by stef
9 months ago
Forum: Syntax
Topic: Error in the constraint writing
Replies: 8
Views: 1076

Re: Error in the constraint writing

Hi Renger, I correct the compilation and now the code runs without problems. Now i'm having problems with the writing of constrains (4), (5) and (6), because of: the presence of the variable x(i,j) instead of the variable x(i,t); the presence of the parameter a(k,i) and r(t,k) instead of the paramet...
by stef
9 months ago
Forum: Syntax
Topic: Error in the constraint writing
Replies: 8
Views: 1076

Re: Error in the constraint writing

Hi Ranger and thank for your answer. Well, now i'm going to attach the code that i wrote. I wrote only the parameter, the function objective (1) (called "fob" in the code) and the constraint (3) (called "vincolo3(i)" in the code). Please, answer me if you have more hints or if you can write this cod...
by stef
10 months ago
Forum: Syntax
Topic: Error in the constraint writing
Replies: 8
Views: 1076

Error in the constraint writing

Good morning to all. I'm trying to write the first objective function and the constraint 3 of the attached file, but GAMS gives me these error: obf .. z1 =E= sum(i,t$(ord(t)<=card(U)-d(i))), b(i,t)*x(i,t); $148 $198,154 $654,409 constr3(i) .. sum(t$(ord(t)<=card(U)-d(i)+1), x(i,t)) =L= 1; $198 U is ...
by stef
1 year ago
Forum: Modeling
Topic: Problem with Multi-objective ant colony optimization
Replies: 0
Views: 800

Problem with Multi-objective ant colony optimization

Can someone help me with the mathematical formulation of this problem? In particular, I have problem with the range of the summation of the constraints 4, 5, 6.
Project.pdf
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