### GAMS sum and prod syntax_ what different?

Posted:

**Fri Jun 15, 2018 6:16 am**Hi all,

I read GAMS manual and find some unclear points.

I want to know what is the prod meaning in GAMS?

I know that it uses same sysntax as sum. But I am not sure what is it implying in economics.

Sum(j, x(j)) = x1+x2+x3+....xn

What prod(j, x(i, j)) is equivalent to?

Note that I see it uses with objective function.

obj.. UU =e= prod(i,x(i)**alpha(i));

Anyone, please help clarify me.

Thank you,

I read GAMS manual and find some unclear points.

I want to know what is the prod meaning in GAMS?

I know that it uses same sysntax as sum. But I am not sure what is it implying in economics.

Sum(j, x(j)) = x1+x2+x3+....xn

What prod(j, x(i, j)) is equivalent to?

Note that I see it uses with objective function.

obj.. UU =e= prod(i,x(i)**alpha(i));

Anyone, please help clarify me.

Thank you,