Backward Summation

GAMS
1

How can I code a backward summation in GAMS for the formula below. (summing over k backwards from j to 1)


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2

Hi ??



First I should read the guidelines to this forum and post your question properly (and at least put your name somewhere).

Here is a piece of code that does this kind of summation. I suppose you can adjust this for your problem





set k /110/, j /115/;



parameter sumj(j), dummy(k,j);


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  • Initialize dummy

dummy(k,j) = ord(k) + ord(j);





sumj(j) = sum(k$(ord(k) < ord(j)), dummy(k,j));



display sumj;



Cheers



Renger





From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of fdabab2@uic.edu
Sent: Donnerstag, 21. Mai 2015 20:07
To: gamsworld@googlegroups.com
Subject: Backward Summation



How can I code a backward summation in GAMS for the formula below. (summing over k backwards from j to 1)




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