plot FFTW gnuplot

Question

How can I make a plot in Gnuplot like those seen here: http://www.fftw.org/accuracy/G4-1.06GHz-gcc3.4/, i.e. with an explicit x axis? I have a dataset like this:

2   1066.7
4   3122.9
8   4715.2
16  5538.5
32  5757.3
64  5891.4
128 5398.3
256 5280.2
512 5178.4
1024    4048.6
2048    4383
4096    3794.4

Everytime I plot, the x-axis is a linear scale so all of my values are bunched up against the y axis. I want each x value to be equally spaced, like in the linked plots. Thanks.

The plot I am trying to recreate is from FFTW's website, using FFTW benchmark results. I am using Python to call Gnuplot. Sorry for improperly using tags. — Kevin Kelly
– Kevin Kelly, Commented Aug 22, 2012 at 15:18
No problem. I removed the tags which are unnecessary. If you were also looking for a python/matplotlib solution, we could add those tags back on. — mgilson
– mgilson, Commented Aug 22, 2012 at 15:19

mgilson · Accepted Answer · 2012-08-22 14:52:49Z

13

In gnuplot, you need to tell it to use logscale axes (base 2)

set logscale x 2
set xtics 2 #label powers of 2 instead of the default
plot 'dataset.dat' w lines

answered Aug 22, 2012 at 14:52

mgilson

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halex · Accepted Answer · 2012-08-22 14:53:50Z

2

Your x axis should have an logarithmic scale. You can set it with respect to 2 with

set logscale x 2

answered Aug 22, 2012 at 14:53

halex

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