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From: Brendan Halpin <brendan.halpin@ul.ie>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Plotting frequency of word occurences
Date: Tue, 13 Nov 2012 21:11:51 +0000
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On Tue, Nov 13 2012, hogiaus@gmail.com wrote:

> This seems like it should be dead simple, but extensive googleing has
> yielded no results. Say I have a datafile like so:
>
> -----
> neutron
> neutron
> e-
> proton
> [Li]8
> neutron
> [Si]28
> [Li]8
> e-
> -----
>
> And I want to make a histogram that will determine all unique strings,
> and display the counts of each one, e.g. 3 neutron, 2 e-, 1 proton, 2
> [Li]8, 1 [Si]28.

If you're in a unixy environment, first process your data using shell commands:

sort particles.dat | uniq -c > pcount.dat


Then (derived from
http://www.dcs.bbk.ac.uk/~gzoum01/howtos/gnuplot_barcharts.html), in
gnuplot:

gnuplot> set boxwidth 1 relative
gnuplot> set style data histograms
gnuplot> set style fill solid 1.0 border -1
gnuplot> plot [][0:] "pcount.dat" using 1:xticlabels(2)


Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
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