Search found 66 matches

by PeterBe
5 years ago
Forum: Syntax
Topic: Error: Real number expected
Replies: 2
Views: 4468

Re: Error: Real number expected

Thanks Renger for your help. This was indeed the problem.
by PeterBe
5 years ago
Forum: Syntax
Topic: Error: Real number expected
Replies: 2
Views: 4468

Error: Real number expected

Hi all, I have a problem that I do not understand why it occurs. I specify the following options Option optcr = option_relativeGap; Option optca = option_absoluteGap; Option Reslim = option_timeLimit; and I get an error: Ral number expected I read the parameters (option_relativeGap, option_absoluteG...
by PeterBe
5 years ago
Forum: Solvers
Topic: How to get CPLEX time
Replies: 1
Views: 3081

Re: How to get CPLEX time

Has noone encoutered a similar problem?
by PeterBe
5 years ago
Forum: Solvers
Topic: How to get CPLEX time
Replies: 1
Views: 3081

How to get CPLEX time

Hi folks, I am using GAMS with CPLEX as the solver. I want to get the exectution time of the solver (CPLEX time) as a parameter. I serached in the internet and found these two recommendations Source: https://support.gams.com/gams:how_do_i_get_the_total_model_solution_time_in_gams Scalar tcomp, texec...
by PeterBe
5 years ago
Forum: Solvers
Topic: Evolutionary algorithm for a GAMS model
Replies: 2
Views: 4184

Re: Evolutionary algorithm for a GAMS model

No suggestions (this is my last try)?
by PeterBe
5 years ago
Forum: Solvers
Topic: Evolutionary algorithm for a GAMS model
Replies: 2
Views: 4184

Re: Evolutionary algorithm for a GAMS model

Does nobody have a clue if you can use an evolutionary algorithm (or any other metaheuristic) for your GAMS model? I'll be quite thankful If some could share his or her experience or assumptions.
by PeterBe
5 years ago
Forum: Solvers
Topic: Evolutionary algorithm for a GAMS model
Replies: 2
Views: 4184

Evolutionary algorithm for a GAMS model

Hi guys,

I just wanted to ask whether it is possible to solve a GAMS model using an evolutionary algorithm? Or is there one solver that GAMS is compatible with which uses a metaheuristic for solving the optimization problem?

I'd appreciate input.
by PeterBe
5 years ago
Forum: Modeling
Topic: Iterative models/ Dynamic sets
Replies: 10
Views: 10983

Re: Iterative models/ Dynamic sets

Thanks Fred for your answer, there are still a few things that I do not understand. $eval tSlices ceil(card(tt)/288) why do we need a Compile-Time Variable here? You anyways specify the number of total timeslots. So the number of time slices can be computed based on this. map(tSlice,tt) = (ord(tSlic...
by PeterBe
5 years ago
Forum: Modeling
Topic: Iterative models/ Dynamic sets
Replies: 10
Views: 10983

Re: Iterative models/ Dynamic sets

Thanks Fred for your answer, I first of all wanted to try the mapping of the timeslots (without having the nested loop). However I have to admit that I don't the code you posted so I just copied and pasted it in my model (I merely adjusted the number of time slots). The beginning of my model looks l...
by PeterBe
5 years ago
Forum: Modeling
Topic: Iterative models/ Dynamic sets
Replies: 10
Views: 10983

Re: Iterative models/ Dynamic sets

Thanks a lot Fred for your answer and help. I really appreciate the tremendous help in this forum :) it help me solve the problem. Now I want to not only run the model for every household for the entire optimization horizon (all t) but I want for every 288 timeslots to run run the optimization for e...