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RE: [Help-glpk] binary decision variables, --nomip

From: Linder Wolfgang
Subject: RE: [Help-glpk] binary decision variables, --nomip
Date: Fri, 4 Sep 2009 15:46:32 +0200

--mipgap 100000 actually speeds up the program by a factor 2 or more.
But I found out now which calculations need much time: All constraints which 
consider several timesteps at once, for example definitions of ramp-down-time 
of production, minimum up- and down time etc. If I leave out these constraints, 
the program takes about 15 seconds instead of several minutes which is 
comparable with the --nomip option.

Wolfgang Linder
Approvisionnement et Trading
Gestion Court Terme

Groupe E SA
Bd de Pérolles 25
1701 Fribourg
T +41 26 352 71 47
F +41 26 352 71 49

-----Message d'origine-----
De : Andrew Makhorin [mailto:address@hidden
Envoyé : vendredi, 4. septembre 2009 14:47
À : Linder Wolfgang
Cc : address@hidden
Objet : Re: [Help-glpk] binary decision variables, --nomip

> Which is the option that finds the first feasible solution?

Try '--mipgap 1000000' .

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