plot using gnuplot or python

Question

I have a txt file with trajectories. How can I plot the column 3 by gnuplot and have vertical line to separate trajectories.

#indexes:         0
   1        -0.375E+04         0.382E+01        
   2        -0.375E+04         0.332E+01        
   3        -0.376E+04         0.353E+01        
#indexes:        1
   1        -0.735E+04         0.093E+01
   2        -0.735E+04         0.096E+01
   3        -0.735E+04         0.082E+01
   4        -0.735E+04         0.094E+01
#indexes:         2
   1        -0.835E+04         0.401E+01
   2        -0.035E+04         0.438E+01
   3        -0.365E+04         0.438E+01

I have many indexes.

Photo:

meuh · Accepted Answer · 2015-10-27 17:02:28Z

1

Here's an example shell script that works with your example data. It assumes the data is in a file data, creates a 2nd tmp file /tmp/data2, and an image /tmp/data.png.

#!/bin/bash
max=$(awk <data '
 !/^#indexes/{ if($3+0>max)max = $3 }
 END {print max}')

awk <data >/tmp/data2 -vmax="$max" '
  /^#indexes/ {printf "%s %s\n",i,max; next}
              { i++; }'

gnuplot <<\!
set terminal png
set output "/tmp/data.png"
plot "data" using 3 with lines linetype rgb "red",\
 "/tmp/data2" using 1:2 with impulse linetype rgb "blue"
!
# eg: display /tmp/data.png

The first awk finds the max value of the 3rd field. The 2nd awk creates a data line "i max" for each "#indexes" line, where i counts the number of data lines, i.e. the x axis values for the blue vertical lines.

answered Oct 27, 2015 at 17:02

meuh

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1 Comment

Mad Physicist Over a year ago

Very neat that you did the parsing in bash

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