hi …sorry … another question … i want to define a ceil constraint in my code but its non linear… i want to define x=ceil(w(i,j,t,m)/a(m)) that w is a variable & a is a parameter … can u help me to write this code line So that my code stay linear???
On Tue, Jun 16, 2015 at 12:35 AM, Amin Alizadeh wrote:
thank you so much… dear renger… its good Apparently… thanks for your time … good luck…
On Mon, Jun 15, 2015 at 6:53 PM, Renger van Nieuwkoop wrote:
Hi Alim
Here two examples how to do this:
set nodes /1*100/;
alias(nodes,I,j);
** Method 1 using ord
w(i,j,t,m)$(ord(i) eq ord(j))=0;
** method 2 using sameas
w(i,j,t,m)$sameas(i,j) = 0;
Hope this helps
Renger
From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Amin Alizadeh
Sent: Montag, 15. Juni 2015 12:14
To: gamsworld@googlegroups.com
Subject: Re: Necessary guestion
my model is a transportation model and w(i,j,t,m) Refers to number of products delivery from node i to node j that means i & j both refer to nodes then delivery products between i & j is 0. then i have to define a constraint that avoid to w to be positive.one way that i do itØŒis this code:w(1,1,t,m)=0 & w(2,2,t,m)=0 & w(3,3,t,m)=0 & … but if the number of nodes be a lot this code will be infinite line code. then i have to define a general code that cover all i&j that be egual.
On Mon, Jun 15, 2015 at 12:29 PM, Renger van Nieuwkoop wrote:
Hi Amin
This is not difficult to answer, but you should provide more information (read the guidelines to this forum before you post a question).
What elements are in the set I and j? Are the sets related?
The best is always to send the code you have (even if it has errors), so people can easily answer your question without having to guess and code a lot.
Cheers
Renger
From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Amin Alizadeh
Sent: Samstag, 13. Juni 2015 10:18
To: gamsworld@googlegroups.com
Subject: Necessary guestion
hi my dear friends… help me plz.
first i have a variable w(i,j,t,m) and i want to Define a constraint that if Indexs " i " &" j " be egual (i mean i=j) In this case w(i,j,t,m)=0 ???
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