Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j <= i), x(j));
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
\
Hello Nikola,
you should use the ORD() command as follows;
eq(i)… p(i) =e= sum(j$(ord(j) Date: Sat, 5 Feb 2011 18:34:11 -0800
Subject: Summation Problem
From: nikola.didi@gmail.com
To: gamsworld@googlegroups.com
Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
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Hi Nikola
use ord:
set i /1*10/;
alias(i,j);
parameter x(i);
x(i) =uniform(0,1);
variable p(i);
equation eq(i);
eq(i)… p(i) =e= sum(j$(ord(j) wrote:
Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j <= i), x(j));
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
Renger van Nieuwkoop
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To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.
I would like to let you know that Mohammad was very kind to provide
his help. Just in case somebody might be interested in this, I am
posting his hint:
eq(i)… p(i) =e= sum(j$(ORD(j) wrote:
Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j >
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
\
Hello Nikola,
try this:
eq(i)… p(i) =e= sum(j$(ord(j) wrote:
Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j <= i), x(j));
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.
Dear Nikola
In GAMS, set members are stored as strings and not numbers. Therefore
you cannot use relational operators on them directly. Instead, you
should work on their respective orders. Your code will be working if
corrected as follows:
eq(i)… p(i) =e= sum(j$((ord(j) wrote:
Dear All,
I am pretty new to GAMS and I encountered the following problem. I
would like to model relation:
p(i) = x(1) + x(2) + … + x(i), for i = 1, …, 5
where p(i) and x(i) are integer and binary variable, respectively.
I tried using alias and $ without any success. I don’t want to bother
you with the whole formulation, so I am extracting here a few lines of
code that does not work:
set i /1*5/;
alias (i,j);
eq(i)… p(i) =e= sum(j$(j >
I would very much appreciate your help. Please note that it reports
different dimensions (error 148) and incompatible operands (error
135)
Nikola
\