How to express a double summation

[Angelina27]

Hello, I'm fairly new to AIMMS and was wondering what the correct syntax is for a double summation.

Can you just use sum[i, sum[j, expression to be summed]]?  Or is there another way entirely?

Thanks 

[Alexandru Toader]

A way is :

First define a parameter/variable(etc) called TYT(j) , for example,with definition sum (i,ExpressionThanYouWantTheDoubleSomatori (i, j))

after define an other parameter/etc ResultDoubleSomatori with definition sum (j, TYT (j))

Alex

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Il Mar, 29 Mag, 2018 alle 17:56, Angelina27

<angela...@gmail.com> ha scritto:

Hello, I'm fairly new to AIMMS and was wondering what the correct syntax is for a double summation.

Can you just use sum[i, sum[j, expression to be summed]]?  Or is there another way entirely?

Thanks 

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[Mohan]

Hello, 

You can simply write sum[(i,j), Expression to be summed] and the expression will be double summed over both i and j.