Using same index for different sets??
Using same index for different sets??
Hello everyone,
we have to implement a model in GAMS. In this model we have a variable x with the indices i and j.
Our problem is, that i and j belong to different sets in different restrictions.
For example, i belongs to the set C in restriction (2) (please see below) but in restriction (5) it belongs to set N^k.
Our question is: How can we let GAMS know, which sets i and j have to belong to?
Thanks in advance!
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RE: Using same index for different sets??
Hi Gitte
If you have the following
Set i /i1*i10/;
And C is a subset of I, say:
Set c(i) /i1,i2,i3/;
The variable X is defined over the complete set.
You can define an equation (must be over the complete set) as:
Equation my_equation(i) ;
But when you define the equation, you just use c as index:
My_equation(c)..
x(c) =E=1;
Hope this helps
Cheers
Renger
_________________________________________________________________
Dr. Renger van Nieuwkoop
Department of Management, Technology and Economics
Centre for Energy Policy and Economics
Swiss Federal Institute of Technology Zurich
Zürichbergstrasse 18, CH-8032 Zurich
Mobile: +41 79 818 53 73
E-Mail: rengerv@vannieuwkoop.ch
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From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Gitte van den Heuvel
Sent: Samstag, 16. Januar 2016 14:11
To: gamsworld
Subject: Using same index for different sets??
Hello everyone,
we have to implement a model in GAMS. In this model we have a variable x with the indices i and j.
Our problem is, that i and j belong to different sets in different restrictions.
For example, i belongs to the set C in restriction (2) (please see below) but in restriction (5) it belongs to set N^k.
Our question is: How can we let GAMS know, which sets i and j have to belong to?
Thanks in advance!
--
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