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About sets

Posted: Wed Mar 07, 2018 11:14 am
by Emine
Hello guys,
I have a problem about defining one of the set in my model.

Sets in the model:
*o sessions /1*4/

*k booklets /1*m/

*i courses /1*87/

*s students /1*30/;

At the beginning of the study, number of booklets (k) is unknown and my aim is to minimize the total number of booklets.
I define the booklet set 1*m, and i get 767 error (Could not extract number in <element> * <element> list)

How can i define the booklet set?
Thank you guys.


Re: About sets

Posted: Wed Mar 07, 2018 11:58 am
by Renger

If you don't know the exact size of a set, you could define a set s /1*1000/ and then define k as a dynamic subset of a without elements: k(s).
If you have calculated the total number of booklets, you define k(s) as:

k(s)$(ord(s) lt totalnumberbooklets) = YES;

Now, k(s) will have the elements 1 to totalnumberbooklets

Hope this helps

Re: About sets

Posted: Tue Mar 20, 2018 11:05 am
by Emine
Thank you for the reply Renger! it helped.