fixing certain element in a variable set

GAMS
1

hi

Is there any way to fix a certain element in a variable set?
for example:
variables;
.
.
.
’ tp(t) 'if a transferpoint is constructed at node “t” ’ ======>(tp is binary variable)
.
.
.
the “tp.fx(t)=0;” command effects the whole set.
I want only a certain member of the set to be fixed ( like tp(2) )
I reckon it may be possible by defining sub sets, but is there any straightway to do this?

regards
Babak

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2

Hi Babak



Either

Tp.fx(‘2’) = 0;



Or

Set fixt(t) /2/;



Tp.fx(fixt) = 0;





Cheers



Renger

Modelworks

Gewerbestrasse 15

3600 Thun – Switzerland

+41 79 818 53 73

Info@modelworks.ch

blog.modelworks.ch







From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of B.Y
Sent: Freitag, 16. August 2013 06:55
To: gamsworld@googlegroups.com
Subject: fixing certain element in a variable set



hi



Is there any way to fix a certain element in a variable set?

for example:

variables;

.

.

.

’ tp(t) 'if a transferpoint is constructed at node “t” ’ ======>(tp is binary variable)

.

.

.

the “tp.fx(t)=0;” command effects the whole set.

I want only a certain member of the set to be fixed ( like tp(2) )

I reckon it may be possible by defining sub sets, but is there any straightway to do this?



regards

Babak


\

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3

Thanks Renger!

On Friday, August 16, 2013 9:25:18 AM UTC+4:30, B.Y wrote:

hi

Is there any way to fix a certain element in a variable set?
for example:
variables;
.
.
.
’ tp(t) 'if a transferpoint is constructed at node “t” ’ ======>(tp is binary variable)
.
.
.
the “tp.fx(t)=0;” command effects the whole set.
I want only a certain member of the set to be fixed ( like tp(2) )
I reckon it may be possible by defining sub sets, but is there any straightway to do this?

regards
Babak

–
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To post to this group, send email to gamsworld@googlegroups.com.
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