please check my code

GAMS
1

my code in Gams:

con5(s,T)… sum((t,r,c)$( ord(t) le ord(T)+3 and (RR(s,c) eq 1)),x(s,r,t,c))=l=3;


I guess t=T in first summation has problem
please check my first summation(from t=T to T+3) and help me to find the right code.
thanks

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2

Hello

  1. GAMS is not case sensitive, so your identifiers “t” and “T” are indistinguishable to GAMS
  2. You are summing over T, therefore your set of equations con5(c,T) cannot be indexed by T.
  3. You surely got error messages. Did you try to interpret them? They are usually helpful, if one reads them carefully.
  4. You didn’t tell us what you are trying to achieve, so we cannot suggest how to achieve it.

Best regards and good luck
Paul


From: mohsen >
Reply-To: “gamsworld@googlegroups.com” >
Date: Thursday, February 12, 2015 9:03 AM
To: “gamsworld@googlegroups.com” >
Subject: please check my code


[https://lh6.googleusercontent.com/-cdHDAURHnv8/VNyxF6uKVQI/AAAAAAAAAL0/2uL0REB4CTE/s1600/con%2B5.jpg]


my code in Gams:

con5(s,T)… sum((t,r,c)$( ord(t) le ord(T)+3 and (RR(s,c) eq 1)),x(s,r,t,c))=l=3;


I guess t=T in first summation has problem
please check my first summation(from t=T to T+3) and help me to find the right code.
thanks

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3

Reply-to: gamsworld@googlegroups.com


it is about examination timetabling.

t is time(number of permitted days for examination time tabling) and it is from 1 to 20
and T is from 1 to 17

it means we are not going to have more than 3 exams in each 4 day.
then in first constraint it(t) starts from 1 to 4
in second constraint it starts from 2 to 5
in third constraint it starts from 3 to 6
…
and in 17th constraint it starts from 17 to 20 ( because we have just 20 day)

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