conditional operator

GAMS
1

Reply-to: gamsworld@googlegroups.com


Hi Guys,
I tried following $ equation and it compiled perfectly

noback(i)… sum(j$(seq(j) gt 3),x(i,j)) =e= 0

Then i wanted to expend this to include one more set k (summing over k
as well on RHS) and changing the condition a bit as below -

noback(i)… sum((j$(seq(j)<=seq(i)),k),x(i,j,k)) =e= 0;

I get following error messages -

8 ‘)’ expected
37 ‘=l=’ or ‘=e=’ or ‘=g=’ operator expected
148 Dimension different - The symbol is referenced with more/less
indices as declared
409 Unrecognizable item - skip to find a new statement
looking for a ‘;’ or a key word to get started again

**** 4 ERROR(S) 0 WARNING(S)
All symbols and notations are define before cimpiling,
Not able to get this thru, please help if someone can,

thanks
Anupam
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2

Thanks a lot Arne,
yes i was wrong there,
Now it is working,
thanks again,

regards,
Anupam

On Dec 29, 5:28 pm, “Arne Stolbjerg Drud” wrote:

Hi Anupam

You need all the sets ín the sum before the condition, i.e.

noback(i)… sum((j,k)$(seq(j) >
As an alternative, you can use two sums as in

noback(i)… sum(j$(seq(j) >
Good luck

Arne

Arne Stolbjerg Drud
ARKI Consulting & Development A/S
Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark
Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: ad…@arki.dk

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Fra: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] PÃ¥ vegne
af Anupam
Sendt: 29. december 2008 12:03
Til: gamsworld
Cc: anupa...@infosys.com; anupam...@rediffmail.com
Emne: conditional operator

Hi Guys,
I tried following $ equation and it compiled perfectly

noback(i)… sum(j$(seq(j) gt 3),x(i,j)) =e= 0

Then i wanted to expend this to include one more set k (summing over k
as well on RHS) and changing the condition a bit as below -

noback(i)… sum((j$(seq(j) >
I get following error messages -

8 ‘)’ expected
37 ‘=l=’ or ‘=e=’ or ‘=g=’ operator expected
148 Dimension different - The symbol is referenced with more/less
indices as declared
409 Unrecognizable item - skip to find a new statement
looking for a ‘;’ or a key word to get started again

**** 4 ERROR(S) 0 WARNING(S)
All symbols and notations are define before cimpiling,
Not able to get this thru, please help if someone can,

thanks
Anupam
–~–~---------~–~----~------------~-------~–~----~
To post to this group, send email to gamsworld@googlegroups.com
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en
-~----------~----~----~----~------~----~------~–~—



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