Displaying low values in GAMS

GAMS
1

Hey Friends,

Could someone please help me out with a problem I am facing with GAMS.

In my code, there is a variable which has a value of the order 10e-14. However, GAMS displays the value as 0. Is there any way to change the lowest value which the GAMS program can display ?


Neeraj

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2

Hey,
You could try fixing or bounding the variable in question.
Best,
Mohammed I. Shuaibu
PhD Candidate, Department of Economics & Research Fellow, Trade Policy Research and Training Programme (TPRTP)
University of Ibadan
P: +2348033147465

“Above every possessor of knowledge there is One”
Sent from my BlackBerry wireless device from MTN
From: Neeraj Jhaveri
Sender: gamsworld@googlegroups.com
Date: Tue, 26 Jun 2012 12:40:28 +0530
To: gamsworld
ReplyTo: gamsworld@googlegroups.com
Subject: Displaying low values in GAMS


Hey Friends,

Could someone please help me out with a problem I am facing with GAMS.

In my code, there is a variable which has a value of the order 10e-14. However, GAMS displays the value as 0. Is there any way to change the lowest value which the GAMS program can display ?


Neeraj

–
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3

Hi Neeraj

At first sight I would say that it is probably not a good idea to have “meaningful” variable levels of the order of 10e-14.
Whatever the solver you use, it will most likely get in trouble with tolerance levels.
My advice would thus be to reformulate your model by “scaling” your variables such that their nominal value get closer to 1 if possible.

hope this helps,
cheers

Le mardi 26 juin 2012 09:10:28 UTC+2, Neeraj a écrit :


Hey Friends,

Could someone please help me out with a problem I am facing with GAMS.

In my code, there is a variable which has a value of the order 10e-14. However, GAMS displays the value as 0. Is there any way to change the lowest value which the GAMS program can display ?


Neeraj

–
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4

Thank you for your help…



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