[Help-glpk] Problem Has no Primal Feasible Solution
I think that this problem has solution because i have solved it mentally
with only 10 acitivities, but also with 10 activities GLPSOL says that the
problem has no primal feasible solution.
By testing I realized that the causes of the error is precisely this
constraint
with this constraint I would say that each activities begins immediately
after the end of the previous activity
how can i change this constraint?
thank you very much
2012/7/7 glpk xypron <xypron.g...@gmx.de>
> Hello Daniele,
>
> take a look at this constraint:
>
> /* temporal precedence constraint */
> subject to PrecTemp{i in A,j in A}: sum{t in T} tt[t]*x[j,t] >= sum{t in
> T} tt[t]*x[i,t] + d[i];
>
> For i = j it requires non-positive durations 0 >= d[i].
>
> Best regards
>
> Xypron
>
> -------- Original-Nachricht --------
> > Datum: Fri, 6 Jul 2012 12:25:58 +0200
> > Von: Daniele Micarelli <danielemicare...@gmail.com>
> > An: help-glpk@gnu.org
> > Betreff: [Help-glpk] Problem Has no Primal Feasible Solution
>
> > Hi,
> > i'm attaching the two file .mod and .dat to let you know
> >
> > When i run these files with glpsol, i get these two messages at the end:
> >
> > *Model has been successfully generated
> > and
> > PROBLEM HAS NO PRIMAL FEASIBLE SOLUTION
> >
> > *in my opinion should exist one solution
> >
> > it's possible?
>
_______________________________________________
Help-glpk mailing list
Help-glpk@gnu.org
https://lists.gnu.org/mailman/listinfo/help-glpk
