Search found 28 matches

by Rofice
2 years ago
Forum: Syntax
Topic: Problem with loop
Replies: 2
Views: 3891

Re: Problem with loop

Thanks GFA!

Best regards,
Rofice
by Rofice
2 years ago
Forum: Syntax
Topic: Problem with loop
Replies: 2
Views: 3891

Problem with loop

Dear all, I am trying to perform few calculations using loop. However, the formulated syntax is not able to store the last value of parameter b(z) (722) to set u2(zz). Please see the attached model for more details. I will really appreciate it if someone helps me with correcting the codes. syntax.gm...
by Rofice
3 years ago
Forum: Modeling
Topic: Conditional variables
Replies: 4
Views: 3497

Re: Conditional variables

Hi,

Thank you very much for the codes! One more thing, you said bound for big M should be large enough but as small as possible. I am just wondering what will happen if a very very big value for big M is used?

Regards,
Rofice
by Rofice
3 years ago
Forum: Modeling
Topic: Conditional variables
Replies: 4
Views: 3497

Conditional variables

Dear all, I want to model if b(y)<0, then c(y)=b(y), otherwise c(y)=0. Likewise if b(y)>0, then d(y)=b(y), otherwise d(y)=0. Where b,c,d are variables. Attached is the model which is MINLP. I will really appreciate if someone can help me to formulate MILP formulation. Thanks in advance! Kind regards...
by Rofice
4 years ago
Forum: Syntax
Topic: Storing solution
Replies: 2
Views: 2466

Re: Storing solution

Dear Renger,

Thank you very much for the formulation.

kind regards,
Rofice
by Rofice
4 years ago
Forum: Syntax
Topic: Storing solution
Replies: 2
Views: 2466

Storing solution

Dear all, I am facing problem in formulating syntax for storing (recording) the frequency (how many times the same solution is found) of solution. In other words, in the attached model sensitivity analysis is performed and after each iteration, a new solution is found. What I want is to systematical...
by Rofice
4 years ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 6948

Re: Integer cut

Dear Renger and Steve, I really appreciate your suggestions and formulations. Steve, I think you forget to attach the second model because the second file is only GDX. I have made a formulation that systematically adds cuts to model and finds all feasible solution and terminates as soon solution bec...
by Rofice
4 years ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 6948

Re: Integer cut

Hi Renger, Yes, I did. I don't get it. I don't have integer variables in my real model; it only contains binary variables and continuous variables. That's why I just formulated simple model consisting of only binary variables. Now, if I want to use systematic enumeration procedure do I need extra bi...
by Rofice
4 years ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 6948

Integer cut

Dear all, Is there any way to enumerate all possible solutions of attached model in a systematic manner? Currently, I am adding integer cuts one by one after finding solution. I will really appreciate for addressing this issue. Also I want record solution of each integer cut. Best regards, Rofice
by Rofice
5 years ago
Forum: Syntax
Topic: linearization of power function
Replies: 1
Views: 2466

linearization of power function

Hi, I am facing problem in linearizing the below non-separable function. Any suggestions for linearization of the con_1 ?? Best Regards, Rofice variable c ; positive Variable x,y; integer variable z; equation con_1,con_2; con_1.. x =e= y**z; con_2.. c =e= 3*x ; y.up = 3; z.lo = 1; z.up = 4; model m ...