I am really grateful for your help. Thank you.

2015ë…„ 9ì›” 30ì¼ ìˆ˜ìš”ì¼ ì˜¤í›„ 3ì‹œ 12ë¶„ 13ì´ˆ UTC+9, Maxwell Brown ë‹˜ì˜ ë§:

Kafa,

Here is an example for both parameter and variable equations, you can change the sets as you see fit.

As always, McCarl’s guide has a section on subsets:

http://www.gams.com/help/index.jsp?topic=%2Fgams.doc%2Fuserguides%2Fmccarl%2Fsubsets.htm

sets

a /1*4/*

b /58/

c /9*16/*

c1(c) /1316/;

parameter

x1(a,b,c) “first method example parameter”,

k1(c) “first method sum over a and b”,

k2(c) “second method sum over a and b”;

*assign x1 parameter random values

x1(a,b,c) = uniform(0,1);

*first example using condition on LHS:

k1(c)$c1(c) = sum((a,b),x1(a,b,c));

$second example specifying subset indices

k2(c1) = sum((a,b),x1(a,b,c1));

Display k1, k2;

*with variables…

equation sumx1(c),sumx2(c);

variable x(a,b,c);

sumx1(c)$c1(c)… sum((a,b),x(a,b,c))=L=2;

sumx2(c1)… sum((a,b),x(a,b,c1))=L=2;

Best,

Max

On Tuesday, September 29, 2015 at 9:55:53 AM UTC-6, kafa...@gmail.com wrote:

Dear, all. How to translate this formulation to GAMS?

I want to sum values in the specific subset(c1). Not all c.

## Thank you.

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