How to use gnuplot (gnu1)
How to use gnuplot
gnuplot is a public domain plotting program from the Free Software Foundation.
It runs on most systems, except of Macintosh, which is boycotted by the FSF.
It is a powerful program, among other things it produces very good
files, which can be used in the LaTeX files.
Gnuplot Task 1........
Gnuplot Task 2
Gnuplot Task 3........
Gnuplot Task 4........
Functions in Gnuplot (and Fit)
opens the command line interface
usually anounces the standard terminal driver
On the first 'plot' command opens the graphical window
About postscript, see below
There is a number of examples in the working directory. Most important commands:
To load a prepared file of commands: load "probabs.com"
To plot a set of data from a file : plot "probabs"
plot "probabs" using 1,4
plot "probabs" using 1,4 with lines
When you change for example xrange (clear meaning, set xrange [0:6],
you can redraw the picture by replot or rep.
There is a very good help system. Type help to start learning.
Now we copy a command set, illustrating use of USER-DEFINED constants and functi
# This script demonstrates user defined variables
# and user defined functions
a=7 # user defined
d=3 # user defined
f(x)=a*exp(-d*x*x) # user defined
set xrange [-2:2]
set yrange [0:a]
You can paste this directly as an input under gnuplot. The sign '#' starts a c
You can redefine a constant any time later. This can be used for visual fitting.
# Example of visual fitting:
until you have found a good value of a.
To copy the existing picture to a PostScript file:
(To produce an encapsulated postscript file)
set terminal postscript eps monochrome "Courier" 18
set output "fiename.eps" # otherwise writes the postscript into the screen
set size 1.8,1 # for plots which have a long x-axis
set terminal x11 # closes fiename.eps and comes back to X11