sum problem

GAMS
1

Hi, how is it possible to write the summation of x (j) ^ n which x (j) is a defined variable over a defined Set and n goes from 0 to c-1 which c is a defined scalar? So how I can define a set for n which it’s elements are equal to 0 up to scalar c-1 and then how to write the summation of x (j) to the power of n, I wrote
Set n /n0=0, n1=1, …/
sum (n, power (x (j), n))
But it is absolutely wrong, thanks for your help

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2

Hello,

I would do like that:

n/1*C/ C<- could be any number

SUM(n$(ORD(n) LE C-1), power(x(n),n))

I am not entirely sure if this is what you want, because you have another index/set there, j.
If there is not operation over j, then it is the following:

CON(j)… SUM(n$(ORD(n) LE C-1), power(x(j),n))

I hope that helped you.

Best regards,

Konstantinos

Τη Πέμπτη, 29 Ιανουαρίου 2015 - 11:33:35 μ.μ. UTC, ο χρήστης mahmood golabi έγραψε:

Hi, how is it possible to write the summation of x (j) ^ n which x (j) is a defined variable over a defined Set and n goes from 0 to c-1 which c is a defined scalar? So how I can define a set for n which it’s elements are equal to 0 up to scalar c-1 and then how to write the summation of x (j) to the power of n, I wrote
Set n /n0=0, n1=1, …/
sum (n, power (x (j), n))
But it is absolutely wrong, thanks for your help

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3

Thanks too much, it was really useful

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