Re: [Help-glpk] Help-glpk Digest, Vol 128, Issue 7

[Faiza Hamdi]

Bonjour 

svp j'ai besoin de lien de téléchargement de R version la plus récentes.

en plus je trouve des difficultés de téléchargement des fonctions de glpk je sais quelle est le problème. prière de m'envoyer aussi une site des téléchargement des fonctions et la procédure à suivre 

merci pour votre réponse

bien cordialement

faiza hamdi

2013/7/16 <address@hidden>

Send Help-glpk mailing list submissions to
        address@hidden

To subscribe or unsubscribe via the World Wide Web, visit
        https://lists.gnu.org/mailman/listinfo/help-glpk
or, via email, send a message with subject or body 'help' to
        address@hidden

You can reach the person managing the list at
        address@hidden

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Help-glpk digest..."


Today's Topics:

   1. problem with glp_load_matrix (Hector Arciniegas)
   2. Re: problem with glp_load_matrix (Michael Hennebry)


----------------------------------------------------------------------

Message: 1
Date: Mon, 15 Jul 2013 13:00:06 -0430
From: Hector Arciniegas <address@hidden>
To: address@hidden
Subject: [Help-glpk] problem with glp_load_matrix
Message-ID: <address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Dear friends.
I am using python with glpk (python-glpk_0.4.45-1_i386) under ubuntu
12.04 for resolve knapsack problems, this work good from 4 to 500
variables; but for 1000 variables send me the follow message: "Violaci?n
de segmento (`core' generado)", after execute "glp_load_matrix(prob,
2*items, ia, ja, ar)"
Has somebody one idea about?. Thanks.
Hector.



------------------------------

Message: 2
Date: Mon, 15 Jul 2013 15:13:14 -0500 (CDT)
From: Michael Hennebry <address@hidden>
To: Hector Arciniegas <address@hidden>
Cc: address@hidden
Subject: Re: [Help-glpk] problem with glp_load_matrix
Message-ID:
        <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

On Mon, 15 Jul 2013, Hector Arciniegas wrote:

> Dear friends.
> I am using python with glpk (python-glpk_0.4.45-1_i386) under ubuntu 12.04
> for resolve knapsack problems, this work good from 4 to 500 variables; but
> for 1000 variables send me the follow message: "Violaci?n de segmento
> (`core' generado)", after execute "glp_load_matrix(prob, 2*items, ia, ja,
> ar)"
> Has somebody one idea about?. Thanks.

It looks like an attempt to dereference a null pointer.
That is what malloc returns if it fails.
Does glpk or python use malloc without testing the return value?
My recollection is that glpk uses xmalloc, which is
a wrapper that tests the return value of malloc.
That said, a 1000 variable knapsack problem seems
a little small to be causing memory issues.

BTW a general MIP solver might not be the
best way to solve your knapsack problems.
That said, if it works well enough,
'tain't worth much effort to find something better.

--
Michael   address@hidden
"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

------------------------------

_______________________________________________
Help-glpk mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/help-glpk


End of Help-glpk Digest, Vol 128, Issue 7
*****************************************