Reply-to: gamsworld@googlegroups.com
thanks for answering
On Friday, October 31, 2014 11:36:56 AM UTC+3:30, manhtuong wrote:
Hi Mohsen,
I don’t know which solver you are using, the solution I suggest below is for CPLEX solver. I believe you can do similar thing for other solver.
You can work around this issue by adding the value of feasibility tolerance to your RHS value.
For example, by default this feasibility tolerance is 1e-6 in CPLEX.
To model the constraint Ax + By > RHS
you can model it in GAMS as Ax + By >= RHS + 1e-6
Hope this help.
Cheers
Tuong Nguyen
Feasibility tolerance. This specifies the degree to which a problem’s basic variables may violate their bounds. This tolerance influences the selection of an optimal basis and can be reset to a higher value when a problem is having difficulty maintaining feasibility during optimization. You may also wish to lower this tolerance after finding an optimal solution if there is any doubt that the solution is truly optimal. If the feasibility tolerance is set too low, Cplex may falsely conclude that a problem is infeasible.
Range: [1e-009,0.1]
(default = 1e-006)
On Friday, October 31, 2014 5:16 AM, mohsen wrote:
no one know about that?
maybe it is a problem in GAMS !
I have some constraints with > ( not >=) but I can’t define it in GAMS!
is it possible to use
On Wednesday, October 29, 2014 6:23:46 PM UTC+3:30, mohsen wrote:
you mean we can’t define > and (strictly greater than) and =
=l= instead of (strictly greater than) and < (strictly less than)
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