Can't specify x range using gnuplot.py

Question

I'm currently trying to produce graphs using gnuplot within a python script but I'm getting this error:

line 0: Can't plot with an empty x range!

I don't know why my xrange isn't being recognised because I have included it in my code as shown below along with the rest of my gnuplot code within my python script.

### GNUPLOT CODE ####  
g = Gnuplot.Gnuplot() 
g('set terminal png')

# Graph layout settings
g('set term png size 1200, 800')
g('set lmargin 8')
g('set rmargin 4')
g('set tmargin 3')
g('set bmargin 3')

# Set the name of the output file
g('set output "' + outputFile + '"')

# Format the time
g('set timefmt "%H:%M:%S"')
g('set format x "%H:%M:%S"')

# Set title and labels of the graph. Specify where the x axis starts and ends.
g('set title "' + title + '"')
g('set xlabel "time"')
g('set ylabel "percent"')
g('set xrange ["15:43:59":"15:48:56"]')

# Use the .txt file specified by the user to create the graph
g('plot "' + inputFile + '" using 1:3 title "user" with lines')

Tom Fenech · Accepted Answer · 2014-08-27 21:43:49Z

2

You're only missing a

g('set xdata time')

Therefore, gnuplot tries to parse the strings a numbers and ends up with set xrange [15:15], which is an empty range. You'll observe the same error message with

set xrange ["15:43:59":"15:48:56"]
plot x

edited Aug 27, 2014 at 21:43

Tom Fenech

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answered Aug 27, 2014 at 18:33

Christoph

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1 Comment

Mark O'Sullivan Over a year ago

Can't believe it was only 1 line of code I was missing which was causing it to not work. Thanks for helping!

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