loop over a set

GAMS
1

Hello everyone,

i want to loop over a set and get the value of the set elements, something like this:

Set fr_fea /2,3/;
scalar k;
loop(fr_fea,
k = fr_fea;
);

But something seems to go wrong. Anyone could help me out?

Thanks in advance,

Fede

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2

Hi Fede,

You must not equal a set to a parameter or scalar. Use ordinality of set for example ord(fr_fea)

Have a nice day,
Nazmi


Kimden: Federico Perea
Gönderme tarihi: ‎18‎ ‎Aralık‎ ‎2013‎ ‎Çarşamba ‎11‎:‎48
Kime: gamsworld@googlegroups.com

Hello everyone,

i want to loop over a set and get the value of the set elements, something like this:

Set fr_fea /2,3/;
scalar k;
loop(fr_fea,
k = fr_fea;
);

But something seems to go wrong. Anyone could help me out?

Thanks in advance,

Fede

–
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3

Thanks Nazmi. I tried this, but then it makes k=1 and k=2 (the first and second element of the set) and I want k=2 and k=3 (the values I gave to the elements). I tried to do something like

n(‘2’) = 2; n(‘3’) = 3, and then make k=n(fr_fea). But I don’t think it is very elegant. This would be my code (see the different displays in the different loops):

Set fr_fea /2,3/;
Parameter n(fr_fea);
n(‘2’) = 2;
n(‘3’) = 3;
scalar k;
loop(fr_fea,
k = ord(fr_fea);
display k;
);

loop(fr_fea,
k = n(fr_fea);
display k;
);

Regards


On Wed, Dec 18, 2013 at 10:56 AM, Nazmi Åžener wrote:

Hi Fede,

You must not equal a set to a parameter or scalar. Use ordinality of set for example ord(fr_fea)

Have a nice day,
Nazmi


Kimden: Federico Perea
Gönderme tarihi: 18 Aralık 2013 Çarşamba 11:48
Kime: gamsworld@googlegroups.com

Hello everyone,

i want to loop over a set and get the value of the set elements, something like this:

Set fr_fea /2,3/;
scalar k;
loop(fr_fea,
k = fr_fea;
);

But something seems to go wrong. Anyone could help me out?

Thanks in advance,

Fede

–
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4

Hi Frederico

You can use fr_fea.val if the set elements are in fact numbers.

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 Federico Perea
Sent: Mittwoch, 18. Dezember 2013 11:07
To: gamsworld@googlegroups.com
Subject: Re: loop over a set



Thanks Nazmi. I tried this, but then it makes k=1 and k=2 (the first and second element of the set) and I want k=2 and k=3 (the values I gave to the elements). I tried to do something like



n(‘2’) = 2; n(‘3’) = 3, and then make k=n(fr_fea). But I don’t think it is very elegant. This would be my code (see the different displays in the different loops):



Set fr_fea /2,3/;

Parameter n(fr_fea);

n(‘2’) = 2;

n(‘3’) = 3;

scalar k;

loop(fr_fea,

k = ord(fr_fea);

display k;

);



loop(fr_fea,

k = n(fr_fea);

display k;

);



Regards



On Wed, Dec 18, 2013 at 10:56 AM, Nazmi Åžener wrote:

Hi Fede,



You must not equal a set to a parameter or scalar. Use ordinality of set for example ord(fr_fea)



Have a nice day,

Nazmi





Kimden: Federico Perea
Gönderme tarihi: 18 Aralık 2013 Çarşamba 11:48
Kime: gamsworld@googlegroups.com



Hello everyone,



i want to loop over a set and get the value of the set elements, something like this:



Set fr_fea /2,3/;

scalar k;

loop(fr_fea,

k = fr_fea;

);



But something seems to go wrong. Anyone could help me out?



Thanks in advance,



Fede

–
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5

Thanks Renger, it works!


On Wed, Dec 18, 2013 at 11:17 AM, Renger van Nieuwkoop wrote:

Hi Frederico

You can use fr_fea.val if the set elements are in fact numbers.

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 Federico Perea
Sent: Mittwoch, 18. Dezember 2013 11:07
To: gamsworld@googlegroups.com
Subject: Re: loop over a set



Thanks Nazmi. I tried this, but then it makes k=1 and k=2 (the first and second element of the set) and I want k=2 and k=3 (the values I gave to the elements). I tried to do something like



n(‘2’) = 2; n(‘3’) = 3, and then make k=n(fr_fea). But I don’t think it is very elegant. This would be my code (see the different displays in the different loops):



Set fr_fea /2,3/;

Parameter n(fr_fea);

n(‘2’) = 2;

n(‘3’) = 3;

scalar k;

loop(fr_fea,

k = ord(fr_fea);

display k;

);



loop(fr_fea,

k = n(fr_fea);

display k;

);



Regards



On Wed, Dec 18, 2013 at 10:56 AM, Nazmi Åžener wrote:

Hi Fede,



You must not equal a set to a parameter or scalar. Use ordinality of set for example ord(fr_fea)



Have a nice day,

Nazmi





Kimden: Federico Perea
Gönderme tarihi: 18 Aralık 2013 Çarşamba 11:48
Kime: gamsworld@googlegroups.com



Hello everyone,



i want to loop over a set and get the value of the set elements, something like this:



Set fr_fea /2,3/;

scalar k;

loop(fr_fea,

k = fr_fea;

);



But something seems to go wrong. Anyone could help me out?



Thanks in advance,



Fede

–
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