Hi Fred,
Many thanks for your reply.
I totally understand it now.
Best regards,
Search found 13 matches
- 5 years ago
- Forum: Syntax
- Topic: GAMS sum and prod syntax_ what different?
- Replies: 3
- Views: 6121
- 5 years ago
- Forum: Syntax
- Topic: GAMS sum and prod syntax_ what different?
- Replies: 3
- Views: 6121
GAMS sum and prod syntax_ what different?
Hi all, I read GAMS manual and find some unclear points. I want to know what is the prod meaning in GAMS? I know that it uses same sysntax as sum. But I am not sure what is it implying in economics. Sum(j, x(j)) = x1+x2+x3+....xn What prod(j, x(i, j)) is equivalent to? Note that I see it uses with o...
- 6 years ago
- Forum: Modeling
- Topic: uncontrolled set entered as constant
- Replies: 1
- Views: 2814
uncontrolled set entered as constant
Hi there, I want to represent my production equation X=AX*d in GAMS. However, when I fill in the equation,it showed uncontrolled set entered as constant error. I supposed that error come from set since I plus the different set together. But I am not sure if I want to write this GAMS equation syntax ...
- 6 years ago
- Forum: Syntax
- Topic: Syntax equation
- Replies: 0
- Views: 2523
Syntax equation
Hi there,
I am practicing building IO model by using GAMS.
I try to formulate equation syntax to represent IO, but I cannot do it.
So I cannot let program to calculate x1,x2,x3,m,w,depr and profit per sector.
I attached my GAMS file. Could you please advise?
Thank you so much
Best regards,
I am practicing building IO model by using GAMS.
I try to formulate equation syntax to represent IO, but I cannot do it.
So I cannot let program to calculate x1,x2,x3,m,w,depr and profit per sector.
I attached my GAMS file. Could you please advise?
Thank you so much
Best regards,
- 6 years ago
- Forum: Syntax
- Topic: Fill in equation_Basic IO model
- Replies: 1
- Views: 2367
Re: Fill in equation_Basic IO model
Above problem might not be difficult.
But your help will help me identify the key concept to code the equation more efficiently.
Thank you very much.
But your help will help me identify the key concept to code the equation more efficiently.
Thank you very much.
- 6 years ago
- Forum: Syntax
- Topic: Fill in equation_Basic IO model
- Replies: 1
- Views: 2367
Fill in equation_Basic IO model
Hi, I am practicing building IO model by using GAMS. Could you please help me fill me the equation to let model calculate x1,x2,x3,m,w,depr and profit per sector. As I know, I have to use the equation x=Ax+d. But how to code above eqn in to program is a problem. I try to do it many times but still c...
- 6 years ago
- Forum: Syntax
- Topic: dynamic growth syntax without max/min solve statement
- Replies: 1
- Views: 2126
dynamic growth syntax without max/min solve statement
Hi, I am trying to do future projection of population. Understand that GAMS modeling standard requires model and solve statement. I am not sure if in my case I do not want to maximize or minimize anything. I just want GAMS to calculate future population. How can I complete below program? Set t / 198...
- 6 years ago
- Forum: Modeling
- Topic: Dimension different in GAMS error message
- Replies: 2
- Views: 3386
Re: Dimension different in GAMS error message
1) Understand that GAMS can only maximize one dimension variable. In my case, I try to do maximize one dimension varibale as well so I give syntax CCntry("NETHERL"). I want to confirm is this the correct syntax? If not how can I handle this situation? 2) When I wan to maximize 2 variable i...
- 6 years ago
- Forum: Modeling
- Topic: Dimension different in GAMS error message
- Replies: 2
- Views: 3386
Dimension different in GAMS error message
Hi, I tried to run acid model and found one error. Error148 Dimension different - The symbol is referenced with more/less indices as declared This occurred only when I change the solve statement from minimizing C to minimizing Ccntry("NETHERL"). Could you please advise how to fix it? Thank...
- 6 years ago
- Forum: Syntax
- Topic: Dimension different error
- Replies: 0
- Views: 2563
Dimension different error
Hi, I tried to run acid model and found one error. Error148 Dimension different - The symbol is referenced with more/less indices as declared This occurred only when I change the solve statement from minimizing C to minimizing Ccntry("NETHERL"). Could you please advise? *******************...