Error 148 when dealing with the $-Operator

GAMS
1

Hey guys,

I’m currently working on the implementation of a model in GAMS. There is, however, a problem which I simply cannot solve.

Here is the restriction I’m currently having problems with:

XS_{k+1,w} = XF_{k,w} + W_{k,w} forall k <= K-1, forall w

Here is the GAMS-Code (reduced to the essential stuff):

sets

w
k

parameters

d(k,w)
b(k)

variables

XS(k,w)
XF(k,w)
Wait(k,w)

equations

NB2(k,w);


NB2(k,w)$(k <= card(k)) … XS(k+1,w) =e= XF(k,w) + Wait(k,w);

The error I’m getting is 148 (Dimension different) as soon as I put the part $(k <= card(k))in.

Does anyone have an idea how to fix this? Thanks in advance!









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2

Stefan:



K is not a number but an element in a set. You need to use the ord function to convert an element into a number:



NB2(k,w)$(ord(k) <= card(k))



Regards



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: adrud@arki.dk



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Stefan Heinemann
Sent: Tuesday, November 19, 2013 1:10 PM
To: gamsworld@googlegroups.com
Subject: Error 148 when dealing with the $-Operator



Hey guys,



I’m currently working on the implementation of a model in GAMS. There is, however, a problem which I simply cannot solve.



Here is the restriction I’m currently having problems with:



XS_{k+1,w} = XF_{k,w} + W_{k,w} forall k <= K-1, forall w



Here is the GAMS-Code (reduced to the essential stuff):



sets



w

k



parameters



d(k,w)

b(k)



variables



XS(k,w)

XF(k,w)

Wait(k,w)



equations



NB2(k,w);





NB2(k,w)(k <= card(k)) .. XS(k+1,w) =e= XF(k,w) + Wait(k,w); \ \ \ The error I'm getting is 148 (Dimension different) as soon as I put the part (k <= card(k))in.



Does anyone have an idea how to fix this? Thanks in advance!




















\

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3

Reply-to: gamsworld@googlegroups.com

Thanks a lot, Arne! It works. :slight_smile:

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