Search found 28 matches
- 6 years ago
- Forum: Modeling
- Topic: Problem with Constraint
- Replies: 1
- Views: 2525
Problem with Constraint
Hi, I am facing problem in making some constraints. At the end of this briefing you can find model. One can see eq_2 under mixer section, it is non-linear equation and I want to transform into linear equation because I am using MIP modelling. Eq_5 is basically energy balance equation of the below fo...
- 6 years ago
- Forum: Archive Google Group
- Topic: mip error
- Replies: 2
- Views: 4093
Re: mip error
Thanks Renger for your response. I figured out that problem but now I have other problem. I want to transform below equation x = fc('1','H2O')/f('1') where x = composition of water in stream 1 fc('1','H2O') = component flow of water in stream 1 f('1') = total flow of stream 1 Also all x,fc and f are...
- 6 years ago
- Forum: Modeling
- Topic: Reformulation
- Replies: 0
- Views: 2209
Reformulation
Hi Everyone! How to convert following non linear equation into linear z =x/y where z,x and y are continuous variables one way, I figured out from literature is below z*y = x (but this case is only true if z is constant, so this will not work for me) So, anybody please share the technique for reformu...
- 6 years ago
- Forum: Archive Google Group
- Topic: mip error
- Replies: 2
- Views: 4093
mip error
Hi all, Can anybody help me in finding the problem of following model binary variable b1 b2 ; positive variable p pressure 1 t temperature 1 t2 temperature 2 p2 pressure 2 ; variable obj ; equation a1 a2 a3 a4 a6 a7 ; a1.. t =e= 2*p ; a2.. p =l= 1000*b1 ; a3.. t2 =l= 8*p2 ; a4.. p2=e= 1000*b2; a6.. ...
- 6 years ago
- Forum: Syntax
- Topic: if statement with constarints
- Replies: 2
- Views: 5803
algorithm error
Hi,
Could anyone tell what this error means, apparently syntax for calling algorithm seems correct and as follow
OPTION MINLP = LMLBOA ;
while error massage is attached in attachment, if more information is required to understand error please let me know.
Regards
Could anyone tell what this error means, apparently syntax for calling algorithm seems correct and as follow
OPTION MINLP = LMLBOA ;
while error massage is attached in attachment, if more information is required to understand error please let me know.
Regards
- 6 years ago
- Forum: Archive Google Group
- Topic: Please help with a loop
- Replies: 3
- Views: 15483
Re: Please help with a loop
Hi, The problem with the equation is You have to enter constant here. You can do this by summing or specifying certain for example 1. Load_balance.. X_g + X_pv -sum(t,L(t)) =E= 0 ; 2. Load_balance.. X_g + X_pv -L('t1') =E= 0 ; Otherwise GAMS dont know which element to select from the domain t until ...
Re: Error
Thank you very much for helping me.
Could you tell me how to make set controlled, As I am freshman, so mostly the error I receive is "uncontrolled set entered as a constant"
for example just see this syntax
material.. sum(pm(i,m),spltfrc(i,m)*f(i)) =e= sum(fm(i,m),f(i)) ;
Could you tell me how to make set controlled, As I am freshman, so mostly the error I receive is "uncontrolled set entered as a constant"
for example just see this syntax
material.. sum(pm(i,m),spltfrc(i,m)*f(i)) =e= sum(fm(i,m),f(i)) ;
Error
I am finding error in objective function, I will highly appreciate, If somebody tell me reason of error. Below is the detail of model.. sets str process streams / 1*2/ comp compressor /1/ compon component feed /h2/ icomp(comp,str) inlet stream of compressor /1.1/ ocomp(comp,str) outlet stream of com...