[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 <[email protected]> > 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 <[email protected]> > > An: [email protected] > > 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? >
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