[Help-glpk] Re: Random number seed

[glpk xypron]

Hello Jeffrey,

you are right, the option is:

  --seed value      initialize pseudo-random number generator used in
                     MathProg model with specified seed (any integer);
                     if seed value is ?, some random seed will be used

AMPL allows the following:
comand line argument -sN where N is the seed
AMPL command 'option randseed n;' where n is the seed

It would be helpful for testing models with different random values
to add the following syntax to GMPL:

option randseed <numerical expression>;
E.g.
option randseed gmtime();

Best regards

Xypron

-------- Original-Nachricht --------
> Datum: Thu, 8 Jul 2010 17:35:14 -0400
> Betreff: Re: Random number seed

> We discussed this a while back.  Andrew did provide a means to set the
> seed
> as a command line option in glpsol, but I'm not aware of any way to set
> the
> seed in directly in GMPL.  If I'm mistaken on this, I'd be happy to be
> corrected.
> 
> Jeff
> 
> 
> On Thu, Jul 8, 2010 at 5:30 PM, glpk xypron <address@hidden> wrote:
> 
> > Hello Andrew,
> >
> > in his article Jeffrey remarks the missing possibility to
> > set the random number seed in GMPL.
> >
> > This question has been discussed before:
> > http://lists.gnu.org/archive/html/help-glpk/2008-12/msg00129.html
> >
> > Best regards
> >
> > Xypron
> > -------- Original-Nachricht --------
> > > Datum: Thu, 8 Jul 2010 17:04:33 -0400
> > > Betreff: [Help-glpk] Portfolio Optimization Example
> >
> > > For what it is worth, I put up a portfolio optimization example on the
> > > wikibook page under GMPL examples. I'd appreciate any thoughts or
> > feedback
> > > on this.
> > >
> > > Jeff
> > >
> > > http://en.wikibooks.org/wiki/GLPK/Portfolio_Optimization
> >
> > --
> > GMX DSL: Internet-, Telefon- und Handy-Flat ab 19,99 EUR/mtl.
> > Bis zu 150 EUR Startguthaben inklusive! http://portal.gmx.net/de/go/dsl
> >

-- 
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