Search found 4 matches

by meelih
6 years ago
Forum: Modeling
Topic: Stuck at some tolerance value
Replies: 1
Views: 2128

Stuck at some tolerance value

I modeled a workforce planning problem in GAMS. The model generally assigns workers to shifts and to tasks according to their skill set and according to the given workload. In the model we only have 5 regular workers and 17 subcontracted workers (they are used when needed and costs extra). The probl...
by meelih
6 years ago
Forum: Syntax
Topic: Questions about Summation
Replies: 1
Views: 2828

Questions about Summation

Hi, i have two questions about sum notation Think that i have a set t /1*10/ and i have a binary variable x(t) questions 1) How can i sum x(t) starting from t=2 2) How can i exclude t values which i want that is: I want to say that sum(t, x(t)) =e= 1 BUT i dont want this equation include t=9 and t=1...
by meelih
6 years ago
Forum: Syntax
Topic: Dimension Different Error
Replies: 3
Views: 3485

Re: Dimension Different Error

Thank you for reply. It has worked. I want to ask one more thing. for example i defined two sets. i /1*3/ and j /1*3/ and i defined binary variable x(i) and i want to use j in variable x as a set. I mean i want gams to understand x(j) since both i and j are defined /1*3/ How can i do that. Note: Whe...
by meelih
6 years ago
Forum: Syntax
Topic: Dimension Different Error
Replies: 3
Views: 3485

Dimension Different Error

Hi i am trying to do modelling in gams but i faced such a problem: in one of my equations i write precedence(i).. sum(k, x(i,k)*k) =L= something for example. When i write like this it gives dimension different error. But if i write this equation in opened form for i=1 for example, it doesnt give any...