Problem with the product of integer and binary variables

GAMS
1

i am trying to maximize obj=sum(t,Cy(t)).
t is the set /110/.

when i try to maximize/minimize, it is choosing small C(say 14) and
takes all binary variables as 1. But i am interested in C greater than
50. it is showning infeasible soln. i want C to be big and y(t) should
be combiantions of 0’s and 1’s. Could anyone suggest, why this
product combination is not working. why binary variable is not
changing.

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2

I don’t get this. If this is the only part of the model the maximum is
clearly reached if you set all your binary variables to one. I don’t
understand why things would change as long as C is positive. If C
becomes negative, all binaries will switch to 0. There is probably
more to it, so you might want to send your complete GAMS model.

Hope this helps,
Michael Bussieck - GAMSWorld Coordinator

On Sep 28, 2:38 pm, swin wrote:

i am trying to maximize obj=sum(t,Cy(t)).
t is the set /110/.

when i try to maximize/minimize, it is choosing small C(say 14) and
takes all binary variables as 1. But i am interested in C greater than
50. it is showning infeasible soln. i want C to be big and y(t) should
be combiantions of 0’s and 1’s. Could anyone suggest, why this
product combination is not working. why binary variable is not
changing.
–~–~---------~–~----~------------~-------~–~----~
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
-~----------~----~----~----~------~----~------~–~—

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