Use dollar condtion with variables

GAMS
1

Hi guys,

I try to use a dollar condition with one variable on gams but generate
an error in GAMS. for example:

r1(num, t)(power(num,t)=l=100)... price(num,t)=e=10; r2(num, t)(power(num,t)=l=50)… price(num,t)=e=5;

where:
variables power(num,t), price(num,t)

Anyone knows how to do it? I really need help with this code.

Regards,

Tiago Sousa

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2

Dear Tiago
This creates endogenous deceleration. One solution can be using binary variables to model what you mean.

Regards

محمد صادق تولّلی
Mohammad Sadegh Tavallali
National University of Singapore



On Sat, Jun 4, 2011 at 6:13 PM, Tiago Sousa wrote:

Hi guys,

I try to use a dollar condition with one variable on gams but generate
an error in GAMS. for example:

r1(num, t)(power(num,t)=l=100)... price(num,t)=e=10; r2(num, t)(power(num,t)=l=50)… price(num,t)=e=5;

where:
variables power(num,t), price(num,t)

Anyone knows how to do it? I really need help with this code.

Regards,

Tiago Sousa

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3

Hi Tiago,

I’m having exactly the same problem you had. How did you solve it?

I would really appreciate your help.

Jose Miguel Hernández.

El sábado, 4 de junio de 2011 05:13:20 UTC-5, Tiago Sousa escribió:

Hi guys,

I try to use a dollar condition with one variable on gams but generate
an error in GAMS. for example:

r1(num, t)(power(num,t)=l=100)... price(num,t)=e=10; r2(num, t)(power(num,t)=l=50)… price(num,t)=e=5;

where:
variables power(num,t), price(num,t)

Anyone knows how to do it? I really need help with this code.

Regards,

Tiago Sousa

–
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4

You cannot use a variable in a $ statement. This should however work with a parameter.
Renger

Sent from my iPhone

Am 04.04.2013 um 16:56 schrieb “jmharango@gmail.com” :

Hi Tiago,

I’m having exactly the same problem you had. How did you solve it?

I would really appreciate your help.

Jose Miguel Hernández.

El sábado, 4 de junio de 2011 05:13:20 UTC-5, Tiago Sousa escribió:

Hi guys,

I try to use a dollar condition with one variable on gams but generate
an error in GAMS. for example:

 r1(num, t)$(power(num,t)=l=100)... price(num,t)=e=10;
 r2(num, t)$(power(num,t)=l=50)... price(num,t)=e=5;

where:
variables power(num,t), price(num,t)

Anyone knows how to do it? I really need help with this code.

Regards,

Tiago Sousa

–
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To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.

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5

you can introduce 2 binary variables
B1(num, t) = 1 if power(num, t) < 100
B2(num, t) = 1 if power(num, t) < 50

then
price =E= B1*(1-B2)*10 + B2 *5;

El sábado, 4 de junio de 2011 05:13:20 UTC-5, Tiago Sousa escribió:
Hi guys,

I try to use a dollar condition with one variable on gams but generate
an error in GAMS. for example:

r1(num, t)(power(num,t)=l=100)... price(num,t)=e=10; r2(num, t)(power(num,t)=l=50)… price(num,t)=e=5;

where:
variables power(num,t), price(num,t)

Anyone knows how to do it? I really need help with this code.

\

To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
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