Map set elements to another set

GAMS
1

The following parameters are given, with a being a subset of aa. However, all the non-overlapping elements of aa with a are already kicked out of emis2. Hence, the remaining aa and a are basically the same.

emis1(r,a,t)
emis2(r,aa,t)

Now I want to define the dimensions of emis2 dependent from a, not aa - so that emis2(r,a,t).

Do you have any idea how I can do that? Maybe by mapping the remaining elements from aa to a?

2

Hi,

Your subject talks about set elements, but your example mentions parameters, so I’m not sure what you’re asking. But perhaps this is what you want:

sets aa / blah blahblah /, a(aa) / blah /;
parameter pa(a), paa(aa);
paa('blah') = 1215;
pa(a) = paa(a);

Since a is a subset of aa, you can index paa by a in the assignment above. The result is independent of paa(‘blahblah’), i.e. of the contents of paa for elements in aa - a.

HTH,

-Steve

3

Hi,

sorry about the confusion with the topic, my question was how the parameter could be defined in dependence from a, not aa.

But your answer actually helped already!!

I now wrote:
sets aa / blah blahblah /, a(aa) / blah /;
parameter pa(a), paa(aa);
pa(a(aa)) = paa(aa);

Thank you so much!!