problem :sigma ==> if i not equal j !!

Archiver · March 12, 2013, 1:42pm

i cant write speak english very good.

sets
p/… /
i(p)
j(p)
;
equation
eq(i);

eq(i)… sigma ( j,x(i,j) ) ====> { if i not equal j !!}

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Archiver · March 12, 2013, 3:36pm

Hi,

You can perhaps use:
eq(i)$(i ne j)… sigma(j, x(i,j))

I am assuming that you don’t have to evaluate the equation for i == j

Thanks
Shashank

On Tue, Mar 12, 2013 at 7:42 AM, hessam parand wrote:

i cant write speak english very good.

eq(i)… sigma ( j,x(i,j) ) ====> { if i not equal j !!}

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Archiver · March 13, 2013, 9:26am

If I understand correctly what you intend to do (i.e. “Sigma” is meant for summation?), then this formulation should do the job :

eq(i) … sum(j $(not sameas(i,j)), x(i,j)) =e= ;

hope this helps
best regards

i cant write speak english very good.

eq(i)… sigma ( j,x(i,j) ) ====> { if i not equal j !!}

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