how to use ord for an uncontrolled set (allias set)

GAMS
1

hi,
for example look at this:

set i /1*10/
allias (i,k)

eq(i)$(ord(i) ne ord(k))…etc

while compiling, i get this error “Uncontrolled set entered as constant”

any suggestions on how i can fix it?
thanks

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2

Hi Reza

It is not clear what you want to achieve as you don’t show the complete equation.
If you use ord(i) ne ord(k) like you do, i and k should be part of the equation declaration (like eq(i,k)).
eq(i,k)$(ord(i) ne ord(k)) will drop all the equations with i equal to k.
Perhaps you should send more information on what you want to achieve.
Cheers
Renger

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From: gamsworld@googlegroups.com [gamsworld@googlegroups.com] on behalf of Reza Bayani [reza.bayani@gmail.com]
Sent: Tuesday, February 16, 2016 08:32
To: gamsworld
Subject: how to use ord for an uncontrolled set (allias set)

hi,
for example look at this:

set i /1*10/
allias (i,k)

eq(i)$(ord(i) ne ord(k))…etc

while compiling, i get this error “Uncontrolled set entered as constant”

any suggestions on how i can fix it?
thanks

–
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3

Dear Renger,
Thanks for your kind reply. i did the trick with changing the equation so that it includes the minus value of sentences when i=k.
Best wishes,
Reza.

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