From: Jean-Julien Fleck <jeanjulien.fleck@...>
Date: 2010-05-11T15:35:49+09:00
Subject: Re: How to Plot Data?

Hello,

> I would like to plot some data from .txt or .csv files. Is it possible?
> And what gem do you use? I found rgnuplot but I can't use it...

Try using ctioga:

sudo gem install ctioga

and then

ctioga file.txt # -> plot column 2 versus column 1
ctioga file.txt@1:4 # -> plot column 4 versus column 1
ctioga file.txt  @1:4 # -> plot column 2 and column 4 against column 1

Try ctioga --help to see all you can do or look at the doc:
http://sciyag.rubyforge.org/ctioga/doc/

NB: I don't think ctioga handles csv yet but a simple regexp could
change all your commas in spaces and you get a valid file. Or even
something like this should be enough.

cat file.csv | tr ',' ' ' > file.txt

NB2: ctioga is currently being reimplemented in ctioga2 which will
have some nice features as being able to be launched from a file
rather than from the command-line, but all the currently available
features of ctioga have not yet been implemented in ctioga2. Look at
http://ctioga2.rubyforge.org/doc/getting-started.html to see if it can
fit your needs.

Cheers,

-- 
JJ Fleck
PCSI1 Lycée Kléber