GAMS World Forum

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....

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...

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 ...

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

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+...

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...

Thanks a lot for your fast reply.
I could have got to this myself. I apologize for not thinking enough, before asking the question.

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...

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...

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 ...