Re: [Help-glpk] Mathprog > SQLite/MySQL > GNUPlot - (Graphing LP and MIP results)

[Noli Sicad]

Hi Xypron,

Thank you very much for doing these 2 illustrations i.e. formatting
gnuplot data in mathprog and graphing ( 2 D bar graph and 3D bar
graphs).

I am more incline to incorporated the gnuplot scripts in MathProg
model for 2 reasons: The first reason,, it would generate the gnuplot
scripts instantly and I just open the gnuplot file in other tab in
GUSEK or GLPK lab and click run - wgnuplot.exe will produce the graph.
Note: GUSEK gnuplot supports already i.e. gnuplot.properties file. The
second reason is, if I open my models 2 years from now, I will not be
seeking the gnuplot that goes with my MathProg model. I could just
click and run and the gnuplot file is generated. No searching for the
gnuplot file.

Xypron, probably you can write other documentation about
GLPK/MathProg, MathProg IDE's (GUSEK), more ODBC examples, Language
Bindings, Graphs, XML, Mac OS X, etc.?

You can title it -" Hidden features and Hacks in GLPK/MathProg"  or
any other title. You can ask glpk / mathprog user group to contribute
as well.

I think Andrew is more incline to write "formal" documentation.
However, new comers and users always ask basic questions and useable
features of glpk/mathprog to address their basic needs.

Just a thought.

Thanks again for the examples.

Regards, Noli

On 6/13/10, glpk xypron <address@hidden> wrote:
> Hello Noli,
>
> another fancy plot of transp.mod can be generated by adding the
> following lines to the model:
>
> solve;
>
> printf '' > 'transp.dat';
> for { i in I  } {
>   for { j in J } {
>     printf '%i "%s"', sum{k in I: k < i} 1, i >> 'transp.dat';
>     printf ' %i "%s"', sum{l in J: l < j} 1, j >> 'transp.dat';
>     printf ' %f', x[i,j] >> 'transp.dat';
>     printf '\n' >> 'transp.dat';
>
>     printf '%i "%s"', sum{k in I: k < i} 1, i >> 'transp.dat';
>     printf ' %i "%s"', sum{l in J: l <= j} 1, '' >> 'transp.dat';
>     printf ' %f', x[i,j] >> 'transp.dat';
>     printf '\n' >> 'transp.dat';
>     }
>     printf '\n' >> 'transp.dat';
>   for { j in J } {
>     printf '%i "%s"', sum{k in I: k <= i} 1, '' >> 'transp.dat';
>     printf ' %i "%s"', sum{l in J: l < j} 1, j >> 'transp.dat';
>     printf ' %f', x[i,j] >> 'transp.dat';
>     printf '\n' >> 'transp.dat';
>
>     printf '%i "%s"', sum{k in I: k <= i} 1, '' >> 'transp.dat';
>     printf ' %i "%s"', sum{l in J: l <= j} 1, '' >> 'transp.dat';
>     printf ' %f', x[i,j] >> 'transp.dat';
>     printf '\n' >> 'transp.dat';
>     }
>     printf '\n' >> 'transp.dat';
>   }
> data;
>
> set I := San-Diego Seattle;
>
> set J := Chicago New-York Topeka;
>
>
> And calling gnuplot with
>
> reset
> set terminal png font "Arial, 16" transparent size 800,800
> set output "transp.png"
> set title 'Result of transp.mod'
> set xtic offset first .5, first -.25, first 0 mirror
> set ytic offset first .25, first .5, first 0 mirror
> set nokey
> set pm3d
> set palette gray
> set grid x y z
> splot 'transp.dat' using 1:3:5:xtic(2):ytic(4) with pm3d
> exit
>
> Resulting in the appended image.
>
> Best regards
>
> Xypron
> --
> GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome
>