Search found 16 matches
- 6 years ago
- Forum: Solvers
- Topic: Binaries with BONMIN Solver
- Replies: 0
- Views: 2530
Binaries with BONMIN Solver
Hey Gams Experts, I got a question about the BONMIN Solver. It's my first time working with this Solver and I don't know really much about it. I've tried to find something in the manuel, but couldn't find or didn't understand the solution to my problem. I'm using BONMIN solver with default settings....
- 6 years ago
- Forum: Syntax
- Topic: Inverting sets
- Replies: 3
- Views: 3298
Re: Inverting sets
Hi cladelpiano, n^-1 should mean, that it is the inverted value. The equation should express, when n is 3: x(1,i+1) = x(3,i) x(2,i+1) = x(2,i) x(3,i+1) = x(1,i) n is not supposed to have 3 members all the time. It represents the number of nodes for a system, so it should be flexible. i represents th...
- 6 years ago
- Forum: Syntax
- Topic: Inverting sets
- Replies: 3
- Views: 3298
Inverting sets
Hi everyone, I have a question according to sets. Imagine the set n, the set i and the subset x(n,i). Is there an easy way to for the equation x(n,i+1) = x(n^-1,i)? Here is what I mean in a more detailed way: set n /1*3/ i /1*20/ x(n,i); So x got 3 values. Let's say they get some values in the time ...
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
Re: logical equations & binary variables
Hi Manassaldi,
thank you a lot for your answer. Apparently I didn't realize, that you already provided the solution I needed.
I'm sorry for that. Thank you a lot for you help!
Cheers
thank you a lot for your answer. Apparently I didn't realize, that you already provided the solution I needed.
I'm sorry for that. Thank you a lot for you help!
Cheers
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
Re: logical equations & binary variables
Hi Manassaldi, thanks again for your answer. I see, that I missunderstood the columen and the equation listing. However I wanted to set the binary variable nrc to prevent the division by zero. e_T_ri(i+1) .. T_ri(i+1) =e= (m_ts_rc(i+1)*T_to(i+1) + m_pb_rc(i+1)*T_po(i+1)) / (m_ts_rc(i+1) + m_pb_rc(i+...
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
Re: logical equations & binary variables
Hi guys, I got another problem, that's based in this here. So coming back to my model, I still want to set the binary variable nrc to 1, when the mass flows m_rc_ts and m_rc_pb both equal to zero. That's why I implemented the following equations: e_nrc_lo(i+1) .. m_rc_ts(i+1)+m_rc_pb(i+1) =g= (1-nrc...
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
Re: logical equations & binary variables
Thanks a lot for your fast reply.
I could have got to this myself. I apologize for not thinking enough, before asking the question.
I could have got to this myself. I apologize for not thinking enough, before asking the question.
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
Re: logical equations & binary variables
Thanks for your fast reply again, Manassaldi. You are really helping me with my project. I got another question: I actually explained wrong, what I want to have. I need the binary variable x to equal 1, when the variable m equals zero. So basically the opposite of the problem I stated before. Is the...
- 6 years ago
- Forum: Syntax
- Topic: logical equations & binary variables
- Replies: 15
- Views: 15909
logical equations & binary variables
Hey guys, I got another question on logical equations or rather binary variables. This is again a beginner question. So right now I'm trying to understand how to set the value of binary variables with conditions. Consider the binary variable x and variable m. If i would write the code in other langu...
- 6 years ago
- Forum: Syntax
- Topic: Synthax of binary variables
- Replies: 3
- Views: 3494
Re: Synthax of binary variables
First of all thanks again for your fast reply. I was a little bit caught in thinking about the model, so I didn't really explain, what it's for. Sorry for that. The idea is, that the binary variable npb(i) is set to one, when the massflows m_pb_rc and m_pb_ts both equal to zero. I need this for the ...