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

[glpk xypron]

Hello Noli,

> Gnuplot users, I need you help how to plot the result - "plot" function

In examples/transp.mod add

solve;
printf '""' > 'transp.dat';
printf {j in J} ' "%s"', j >> 'transp.dat';
printf '\n' >> 'transp.dat';
for {i in I} {
  printf '"%s"', i >> 'transp.dat';
  printf {j in J} ' %f', x[i,j] >> 'transp.dat';
  printf '\n' >> 'transp.dat';
}

This will create the follwing content in file transp.dat:

"" "New-York" "Chicago" "Topeka"
"Seattle" 50.000000 300.000000 0.000000
"San-Diego" 275.000000 0.000000 275.000000

Gnu-Plot expects data for histograms in multiple columns.

Create a file transp.gnuplot with the following lines:

set terminal png truecolor transparent font "Arial, 16" size 800x600 
set output "transp.png"
set title 'Result of transp.mod'
set style data histogram
set style histogram cluster gap 1
set style fill solid border -1
set boxwidth 0.9
set bmargin 5
set grid y
set xrange [-.5:2.5]
set xtics out nomirror
plot 'transp.dat' \
  using 2:xtic(1) title columnheader(2), \
  for [i=3:4] '' using i title columnheader(i)
exit

Execute
gnuplot.exe transp.gnuplot

And you get the appended transp.png.

Best regards

Xypron

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transp.png
Description: PNG image