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Re: [Help-glpk] [Fwd: Providing initial solution]

From: Meketon, Marc
Subject: Re: [Help-glpk] [Fwd: Providing initial solution]
Date: Tue, 17 Sep 2013 11:49:03 -0500

Juan said he received a "segmentation fault" that is mostly likely due to the 
use of memory in the basis factorization.  Providing an initial basis will cut 
down the number of iterations, but I would think it would be highly unlikely to 
cut down the memory requirements.

Juan - are you using the 64-bit or the 32-bit compilation?  If you're using the 
32-bit, then maybe switching to the 64-bit might help if you have lots of 
memory on your machine.

Otherwise, you may have to consider reformulation of your model or another 
technique such as column generation.

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Heinrich Schuchardt
Sent: Tuesday, September 17, 2013 9:56 AM
To: Juan J. Rojas; Help Glpk
Subject: Re: [Help-glpk] [Fwd: Providing initial solution]

Hello Juan,

please, read chapter "LP basis constructing routines" of the doc/glpk.pdf of 
the GLPK source distribution. After constructing a valid basis call 
glp_warm_up() and then glp_simplex() with presolver disabled.

Best regards

Heinrich Schuchardt

> Gesendet: Dienstag, 17. September 2013 um 15:39 Uhr
> Betreff: Re: Aw: [Help-glpk] [Fwd: Providing initial solution]
> Hi Heinrich,
> Yes, I am solving an LP problem. How could I input an initial solution in 
> this case?
> Thanks for your help,
> Juan

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