Search found 22 matches

5 months ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 524

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...
5 months ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 524

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...
5 months ago
Forum: Modeling
Topic: Integer cut
Replies: 7
Views: 524

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
11 months ago
Forum: Syntax
Topic: linearization of power function
Replies: 1
Views: 521

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 ...
11 months ago
Forum: Syntax
Topic: Syntax for sets
Replies: 2
Views: 445

Re: Syntax for sets

Thanks Sir.
11 months ago
Forum: Syntax
Topic: Syntax for sets
Replies: 2
Views: 445

Syntax for sets

Hi, Kindly help me in writing syntax. Set "ssmxr" is the function of (mxr,str). I have two objectives for the set "ssmxr". (1): it can only take values of selected mixers for linearization (see set smxr). (2): it can only take first value of str of selected mixers for linearization Set mxr number of...
1 year ago
Forum: Syntax
Topic: How to model iterative calculation?
Replies: 3
Views: 810

Re: How to model iterative calculation?

Thanks cladelpino for your reply. Let me explain aforementioned problem in another way. I am enclosing a fabricated model to explain my problem in more detail. In the below model profit comes from selling product and subtracting raw material cost. Rate of profit depends upon the selling price of pro...
1 year ago
Forum: Syntax
Topic: How to model iterative calculation?
Replies: 3
Views: 810

How to model iterative calculation?

Hi! I want to perform calculations similar to goal seek function in Microsoft Excel. Below is the problem statement. Let a and b are scalar and their values are below a=2 b=10 c is a parameter and can be estimated by the following relation c=a+b Ofcourse value of 'c' will be 12, but I want to model ...
2 years ago
Forum: Modeling
Topic: Unbounded Solution
Replies: 2
Views: 1213

Re: Unbounded Solution

Dear Renger,
Thank you for your response, I caught your hint. Actually I was not aware that I can use variable f3 as f3.l and then define f4 as a parameter and find f4. Thanks for sharing knowledge.

Warm Regards,
Rofice
2 years ago
Forum: Modeling
Topic: Unbounded Solution
Replies: 2
Views: 1213

Unbounded Solution

Hi All, I am trying to decompose model(may be it is also called multi-objective problem ) in such a way a that value of variables estimated in first sub model can be used for second sub model. But in doing so second model leading to infeasible solution due to unbounded. Please give me suggestions ho...