[ubuntu-uk] process control charts! Chart software
thomas.ibbotson at gmail.com
Fri Feb 27 20:22:49 GMT 2009
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> looks like it is command line based. so probably not for me then ! :(
Don't be so scared of the command line, it's not so hard to learn to use
gnuplot. If you didn't know how to use a GUI application you would have
to spend some time learning, the only difference being with a GUI you
can guess which buttons to press.
So to get you started:
To start gnuplot, just type "gnuplot" at a terminal, then you'll get a
prompt looking something like this:
G N U P L O T
Version 4.2 patchlevel 3
last modified Mar 2008
System: Linux 2.6.27-11-generic
Copyright (C) 1986 - 1993, 1998, 2004, 2007, 2008
Thomas Williams, Colin Kelley and many others
Type `help` to access the on-line reference manual.
The gnuplot FAQ is available from http://www.gnuplot.info/faq/
Send bug reports and suggestions to
Terminal type set to 'wxt'
To plot a graph of sin(x) here's what you'd type:
gnuplot> plot sin(x)
and a graph of sin(x) should pop up in a window.
If you have a file with data in it, as long as they are in columns
gnuplot can plot them easily for you:
where data.txt looks something like:
If you have more than one column, you use the "using" modifier i.e.
gnuplot> plot "data.txt" using 1:3
which tells gnuplot to plot columns 1 and 3 from the data.txt file.
The other important thing to know is how to write something to a file.
First you need to decide what type of file you would like to output,
such as "png" or "postscript". So here are the commands you would type:
gnuplot> set terminal png
[This sets the file to be of type "png"]
gnuplot> set output "mygraph.png"
[This opens the file for writing to it]
gnuplot> plot "data.txt"
[This plots the graph and puts the output into the file]
gnuplot> unset output
[This closes the file]
This is all just straight off the top of my head, so it's really not
hard to use once you've played with it a bit. There's plenty of good
information on the web for using gnuplot, but if you find yourself
stuck, don't hesitate to ask. As you might have noticed I quite like
gnuplot and would be willing to help...
Of course you can always type "help" at the gnuplot command line for
some interactive help.
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