Using nested for loop in gnuplot

Question

I am trying to plot a set of graphs to compare the simulation results with the experimental data. The simulation files are in ordered arrangement on 7X7X7 for various parameters. I need to plot all of those files using a nested for loop for each iXjXk file. The files are named thus : fibrilAll_i_j_k.dat

I have already tried some alternatives like using multiple for loop in the same line. But it doesn't seem to work.

set terminal eps size 1200,800
set output "all.eps"
set title "{/*2 Alternative rates}"
set ylabel "{/*2 fibril mass fraction}" offset 1.5,0,0
set xlabel "{/*2 Time(h)}"
set key left top
plot 'experiment.txt' using 1:6 ps 2 pt 5 title "EXP",\
for [i=1:7] for [j=1:7] for [k=1:7] 'fibrilAll'._i_j_k.'.dat' using 1:2 with lines title 'i,j,k'
replot

I get the following error message:

internal error : STRING operator applied to undefined or non-STRING variable

Ethan · Accepted Answer · 2019-06-10 03:45:01Z

0

I see a few possible problems.

1) I take it you do not want to plot the same file fibrilAll_i_j_k.dat 343 times. If the data files are named e.g. fibrilAll_1_5_3.dat then you can construct that name by saying plot ... sprintf("fibrilAll_%d_%d_%d.dat",i,j,k)

2) Probably you want something similar for the titles

3) The replot does not accomplish anything. Did you leave out something?

answered Jun 10, 2019 at 3:45

Ethan

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2 Comments

Sriram Krishnamurthy Over a year ago

I tried the following and it worked

set terminal png size 1200,800      set output "all.png"       set title "{/*2 Alternative rates}"       set ylabel "{/*2 fibril mass fraction}" offset 1.5,0,0       set xlabel "{/*2 Time(h)}"      set key left top       plot 'experiment.txt' using 1:6 ps 2 pt 5 title "EXP"       do for [i=1:7]{   	    do for [j=1:7]{   		    do for[k=1:7]{   		    filename = sprintf("%s_%d_%d_%d.%s",'fibrilAll',i,j,k,'dat')   	 	    plot filename using 1:2 with lines title "1",\   	 	    }   	     }       }

Ethan Over a year ago

Ah. It was not clear in the original question that you wanted to plot each file separately rather than plotting all of the files in a single figure.

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