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 <[email protected]> > >> 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 [email protected] >> "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 > > >
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