Re: [Help-glpk] help

[Daniele Micarelli]

Re: [Help-glpk] help

r (i) is a parameter and represents the resource request from the i-th activities by the system.
The variable is x (i, t) where i is the index of the activities of the whole W and t is the index of the time interval.
R is the total available resource is not exceeded while d (i) is the duration of the i.th activity

2012/6/26 Michael Hennebry <address@hidden>

On Tue, 26 Jun 2012, Daniele Micarelli wrote:

I have to solve a linear programming problem with the language and I'm
planning mathprog
I have difficulty writing the following constraint: ΣΣ r (i) * x (i, t) <= R
where the first summation is true for all belonging to the W and the second
summation has as its lower end t-d(i) and upper bound as t-1

You've not made it clear what is a variable and what is not.
If r and x are both variables, you are done.
*Linear* programming does not involve products of variables.

--
Michael   address@hidden
"On Monday, I'm gonna have to tell my kindergarten class,
whom I teach not to run with scissors,
that my fiance ran me through with a broadsword."  --  Lily