[scilab-Users] Re: Linear programming with scilab 5

[Alberto Marin]

Thanks a lot. Whenever I have time I will have a look at the algorithm and
try to find out a smaller example.

Alberto

On Wed, Jul 20, 2011 at 2:59 PM, Michaël Baudin
<michael.baudin at scilab.org>wrote:

> **
> I created the bug report : http://bugzilla.scilab.org/show_bug.cgi?id=9751
>
> Regards,
>
> Michaël Baudin
>
> Le 20/07/2011 14:49, Michaël Baudin a écrit :
>
> Le 20/07/2011 13:14, Alberto Marin a écrit :
>
>
>
>>
>>  This kind of rank deficiency is very frequent in this kind of problem
> (biochemical networks) and has never been a problem using the simplex
> method. Since the only thing I know about the karmarkar algorithm is that it
> is an interior point method, I have no clue about what the error message
> about rank deficiency means. I have tried eliminating the redundancies but
> the reesult is the same so the error may refer to a completely different
> issue.
>
>
> The "karmarkar" function has a very poor name: it does *not* implement
> Karmarkar's algorithm... The algorithm used in the function is based on the
> primal affine scaling algorithm, as discovered by Dikin in 1967, and then
> re-discovered by Barnes and Vanderbei et al in 1986.
>
> To move the problem forward, I will create a separate bug report on
> bugzilla.
>
>
>> When you say that you have problems when you use linpro through the Java
>> interface, what do you mean exactly ? Can you provide a script ?
>>
>
> If I  put this problem in an .sce file and execute it, I get the result you
> mention. No problem so far. If I call linpro from the java interface with
> the Siclab.exec() method it also works fine as long as I use a 32 bits
> machine. But calling linpro through  the exec() method in any linux 64 bits
> machine crashes the java virtual machine. This same problem happened
> whenever I called the javasci engine with scilab 4.2 but in 5.3 it is
> restricted to the linpro function, any other operation I've tried so far
> (including karmarkar) seem to work fine.
>
>
> I am not familiar with the javasci engine. Maybe some expert on this topic
> can help...
>
> Regards,
>
> Michaël
>
>
>
> --
> Michaël Baudin
> Ingénieur de développementmichael.baudin at scilab.org
> -------------------------
> Consortium Scilab - Digiteo
> Domaine de Voluceau - Rocquencourt
> B.P. 105 - 78153 Le Chesnay Cedex
> Tel. : 01 39 63 56 87 - Fax : 01 39 63 55 94
>
>
>
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