Search found 8 matches

by Laurus
6 months ago
Forum: Modeling
Topic: Generation time takes too long
Replies: 4
Views: 537

Re: Generation time takes too long

Laurus, I notice the model you sent as opt.gms in your post is customized to work with GDXMRW. This works as long as you stay in a Matlab world, but now when you move to a larger forum, it becomes a problem. Potential avenues of help or discussion are closed off because your model is not a generic ...
by Laurus
6 months ago
Forum: Modeling
Topic: Generation time takes too long
Replies: 4
Views: 537

Re: Generation time takes too long

You're right, my bad. I have attached the missing files.

Thank you,
by Laurus
6 months ago
Forum: Modeling
Topic: Generation time takes too long
Replies: 4
Views: 537

Generation time takes too long

Hello, I have a model I want to run interfaced with matlab and I need to run It several times with diferent parameters in the following schema: MATLAB computations -> GAMS -> MATLAB computations -> GAMS ... Problem is the modelling of my problem takes several hours... Is there any way to speed this ...
by Laurus
7 months ago
Forum: Modeling
Topic: Default output for infeasible problems.
Replies: 1
Views: 307

Default output for infeasible problems.

Hello,

I'm using GAMS interfaced with matlab, and I was wondering if it is possible to obtain a default output from gams in case the problem is infeasible?

By this I mean, that if problem is infeasible "result.l =e= 100000".

Thank you.
by Laurus
7 months ago
Forum: Modeling
Topic: Calculations post solution
Replies: 1
Views: 330

Calculations post solution

Is it possible to do further calculations with the solutions data after the solver?

"Mccarl gams user guide" mentions that "Often modelers employ post solution report writing calculations", but I can't find anything about the syntax that must be used.

Thank you,
by Laurus
7 months ago
Forum: Modeling
Topic: If/then logic with variables
Replies: 1
Views: 1164

If/then logic with variables

I'm modelling a problem on GAMS (interfaced with Matlab) and I'm trying to sort some data before returning the values to Matlab in order to lower the amount of variables transferred back through MATOUT (which increase processing time). pen, P_linha, sumPen and sumPen2 are variables; lim_linhas is a ...
by Laurus
7 months ago
Forum: Modeling
Topic: Error 668 , 37 , 409
Replies: 2
Views: 433

Re: Error 668 , 37 , 409

Thank you,

The other errors were because I was using "pi" as a variable name when apparently there is a function of GAMS with that same name.
by Laurus
7 months ago
Forum: Modeling
Topic: Error 668 , 37 , 409
Replies: 2
Views: 433

Error 668 , 37 , 409

Hello, im getting a few errors in my code (which is interfaced with Matlab) and I'm unable to solve them. 26 $if exists $ include matdata.gms **** $668 1 - Can't understand this error and cant find information about it. 58 PiCalc(b,t).. Pi(b,t) =e= P(b,t) + c(b,t) - d(b,t); **** $37,409 37 '=l=' or ...