Dear GAMS group,
I need help for a coding in GAMS
I would like to code conditional equations in my model.
A = B1 - C1 if B1-C1> B2-C2
A = B2 - C2 if B1-C1 B2-C2
A2… A = B2 - C2 if B1-C1< B2-C2
Thank you very much!!!
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Dear Redwood,
The easiest solution is to define A as larger than both differences and then minimize your variable A (if A is entered in the objective function). Another is to cut the problem in smaller pieces, where e.g. A1 and A2 are introduced. In either case, the solution is strongly dependent on what you do with this variable A after this calculation.
Kind regards,
Henry
On Wednesday, February 27, 2013 3:34:23 PM UTC+1, Redwood wrote:
Dear GAMS group,
I need help for a coding in GAMS
I would like to code conditional equations in my model.
A = B1 - C1 if B1-C1> B2-C2
A = B2 - C2 if B1-C1 B2-C2
A2… A = B2 - C2 if B1-C1< B2-C2
Thank you very much!!!
\
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Dear Redwood,
I hope the dollar operator can address the problem.
A1… A$(B1-C1 ge B2-C2) =e= B1 - C1;
A2… A $(B1-C1 le B2-C2)= e= B2 - C2;
Regards,
Yonas
On Wednesday, February 27, 2013 3:34:23 PM UTC+1, Redwood wrote:
Dear GAMS group,
I need help for a coding in GAMS
I would like to code conditional equations in my model.
A = B1 - C1 if B1-C1> B2-C2
A = B2 - C2 if B1-C1 B2-C2
A2… A = B2 - C2 if B1-C1< B2-C2
Thank you very much!!!
\
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Dear Yonas,
I hadn’t thought of that. Problem is your syntax only works when B1, B2, C1 and C2 are all either sets or parameters. The introducing an either-or variable (binary) and looking at this problem will hopefully help you out.
Kind regards,
Henry
On Wednesday, February 27, 2013 5:38:13 PM UTC+1, Yonas Gebrekiros wrote:
Dear Redwood,
I hope the dollar operator can address the problem.
A1… A$(B1-C1 ge B2-C2) =e= B1 - C1;
A2… A $(B1-C1 le B2-C2)= e= B2 - C2;
Regards,
Yonas
On Wednesday, February 27, 2013 3:34:23 PM UTC+1, Redwood wrote:
Dear GAMS group,
I need help for a coding in GAMS
I would like to code conditional equations in my model.
A = B1 - C1 if B1-C1> B2-C2
A = B2 - C2 if B1-C1 B2-C2
A2… A = B2 - C2 if B1-C1< B2-C2
Thank you very much!!!
\
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Seems I forgot the link:
https://groups.google.com/forum/?fromgroups=#!topic/gamsworld/xlmax6sKWw8[1-25-false]
On Wednesday, February 27, 2013 8:26:32 PM UTC+1, Henry JW Vermue wrote:
Dear Yonas,
I hadn’t thought of that. Problem is your syntax only works when B1, B2, C1 and C2 are all either sets or parameters. The introducing an either-or variable (binary) and looking at this problem will hopefully help you out.
Kind regards,
Henry
On Wednesday, February 27, 2013 5:38:13 PM UTC+1, Yonas Gebrekiros wrote:
Dear Redwood,
I hope the dollar operator can address the problem.
A1… A$(B1-C1 ge B2-C2) =e= B1 - C1;
A2… A $(B1-C1 le B2-C2)= e= B2 - C2;
Regards,
Yonas
On Wednesday, February 27, 2013 3:34:23 PM UTC+1, Redwood wrote:
Dear GAMS group,
I need help for a coding in GAMS
I would like to code conditional equations in my model.
A = B1 - C1 if B1-C1> B2-C2
A = B2 - C2 if B1-C1 B2-C2
A2… A = B2 - C2 if B1-C1< B2-C2
Thank you very much!!!
\
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\