having a set in which the number of elements is not known at first.

GAMS
1

I am new with GAMS. I want to use GAMS for solving the following problem: (in which the number of elements in set i is defined later in the program (the number of elements in set i is calculated based on another input data which will be clarified in the program later (kk)).

set i/ /
parameter y(i);
parameter x;
parameter kk;

x=300;
kk=10;

dev=x/(kk-2);
y(‘1’)=0;
y(‘kk’)=x;

for (i=1 to (kk-1),
y(i)=(2i-3)*dev/2;
);

Actually by this code, I want to discretize the value x in to 10 values and putting those 10 values in an indexed vector (y(i)).

I will really appreciate if anyone can help me.

Thanks in advance.

–
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2

Hi Sarah



There is probably no need for a dynamic set i, but if you really want it just uncomment the commented lines,

Take a good look at ord and card in the manual and look for other examples using ord and card.



set j /1*100/;

  • i(j);



    parameter x,kk;

x = 300;

kk = 10;



*i(j)$(ord(j) eq 1) = YES;

*i(j)(ord(j) le kk) = YES; \ \ \ parameter y(j),dev; \ \ \ dev=x/(kk-2); \ \ \ y(j)(ord(j) eq 1) = 0;

y(j)$(ord(j) eq kk) = x;

y(j)$(ord(j) lt kk) = (2*ord(j)-3)*dev/2;



display y;







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 sarah.piroozi@gmail.com
Sent: Freitag, 16. August 2013 13:34
To: gamsworld@googlegroups.com
Subject: having a set in which the number of elements is not known at first.



I am new with GAMS. I want to use GAMS for solving the following problem: (in which the number of elements in set i is defined later in the program (the number of elements in set i is calculated based on another input data which will be clarified in the program later (kk)).



set i/ /

parameter y(i);

parameter x;

parameter kk;



x=300;

kk=10;



dev=x/(kk-2);

y(‘1’)=0;

y(‘kk’)=x;



for (i=1 to (kk-1),

y(i)=(2i-3)*dev/2;

);



Actually by this code, I want to discretize the value x in to 10 values and putting those 10 values in an indexed vector (y(i)).



I will really appreciate if anyone can help me.



Thanks in advance.

–
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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–
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3

Hi Renger
Thank you so much. It works now.

On Friday, August 16, 2013 5:21:26 AM UTC-7, Renger van Nieuwkoop wrote:

Hi Sarah



There is probably no need for a dynamic set i, but if you really want it just uncomment the commented lines,

Take a good look at ord and card in the manual and look for other examples using ord and card.



set j /1*100/;

  • i(j);



    parameter x,kk;

x = 300;

kk = 10;



*i(j)$(ord(j) eq 1) = YES;

*i(j)(ord(j) le kk) = YES; \ \ \ parameter y(j),dev; \ \ \ dev=x/(kk-2); \ \ \ y(j)(ord(j) eq 1) = 0;

y(j)$(ord(j) eq kk) = x;

y(j)$(ord(j) lt kk) = (2*ord(j)-3)*dev/2;



display y;







Cheers



Renger


\

Modelworks

Gewerbestrasse 15

3600 Thun – Switzerland

+41 79 818 53 73

In…@modelworks.ch

blog.modelworks.ch







From: gams...@googlegroups.com [mailto:gams...@googlegroups.com] On Behalf Of sarah....@gmail.com
Sent: Freitag, 16. August 2013 13:34
To: gams...@googlegroups.com
Subject: having a set in which the number of elements is not known at first.



I am new with GAMS. I want to use GAMS for solving the following problem: (in which the number of elements in set i is defined later in the program (the number of elements in set i is calculated based on another input data which will be clarified in the program later (kk)).



set i/ /

parameter y(i);

parameter x;

parameter kk;



x=300;

kk=10;



dev=x/(kk-2);

y(‘1’)=0;

y(‘kk’)=x;



for (i=1 to (kk-1),

y(i)=(2i-3)*dev/2;

);



Actually by this code, I want to discretize the value x in to 10 values and putting those 10 values in an indexed vector (y(i)).



I will really appreciate if anyone can help me.



Thanks in advance.

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+...@googlegroups.com.
To post to this group, send email to gams...@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
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Visit this group at http://groups.google.com/group/gamsworld.
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