-----Original Message-----
From: help-glpk-bounces+marc.meketon=
oliverwyman.com@
gnu.org [mailto:
help-glpk-bounces+marc.meketon=
oliverwyman.com@
gnu.org] On Behalf Of glpk xypron
Sent: Friday, July 09, 2010 3:37 PM
To: Jeffrey Kantor;
address@hidden
Subject: Re: [Help-glpk] Parametric studies in GMPL?
Hello Jeffy,
you can use a shell script.
Here is a minimalistic example. Save the following as file test.awk
BEGIN {
modfile = "test.mod";
datfile = "test.dat";
system("rm " modfile);
printf ("Writing model file\n");
printf ("#model file\n") > modfile;
printf ("param iter;\n") > modfile;
printf ("solve;\n") > modfile;
printf ("display iter;\n") > modfile;
printf ("end;\n") > modfile;
close(modfile);
for (i = 1; i <= 10; i++) {
system("rm " datfile);
printf("\n\nIteration %i\n",i);
printf ("Writing data file\n");
printf("#data file %i\n", i) > datfile;
printf("data;\n") > datfile;
printf("param iter := %i;\n", i) > datfile;
printf("end;\n") > datfile;
close(datfile);
system("glpsol -m " modfile " -d " datfile);
}
exit;
}
Run the script with
awk -f test.awk
Windows users can find a binary for awk at
http://gnuwin32.sourceforge.net/packages/gawk.htm
For Windows replace "rm " by "del ".
Please, observe that glpsol allows multiple data files,
so you could have one with the changing parameter and another
with the rest of your model data.
Best regards
Xypron
-------- Original-Nachricht --------
> Datum: Fri, 9 Jul 2010 09:15:19 -0400
> Betreff: [Help-glpk] Parametric studies in GMPL?
> Hi --
>
> I'd like to be able to parametric studies in GMPL. In other words, do a
> simple loop over a range of parameter values with the solve statement
> inside
> the loop. To the best of my knowledge this is not currently possible, or
> is
> it? If not, could this be a feature that could be incorporated into GMPL
> at
> some point?
>
> Jeff
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