Using GNUPLOT for <IMG ALIGN=BOTTOM ALT="" SRC="_9659_tex2html_wrap11982.xbm">: a Tutorial
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GNUPLOT is by nature an interactive program. Users making plots for
will generally not use GNUPLOT interactively. Whenever hard
copy is desired from GNUPLOT, the program need not be run on a
graphics terminal. In this case the output is directed to a file or
pipe, then sent to the appropriate output device. For example, output
from the terminal type unixplot may be sent to a program
interpreting the Unix plotting standard. The terminal types imagen and postscript may be used for output to printers
understanding those languages. (A shell script (lasergnu) is
supplied with the distribution that will accept a GNUPLOT command or
input file and send the output to an Imagen or Postscript laser
printer. This script may have been adapted to your site.) The terminal
type fig outputs FIG code that can be read by the Fig graphics
program and translated into forms usable in both 
and
documents.
We now ignore the interactive nature of GNUPLOT and provide the input
to GNUPLOT from a file, i.e.,
gnuplot gnu.input
In this example, all of the commands to GNUPLOT are contained in the
file gnu.input. Multiple filenames may be supplied to GNUPLOT
this way, read in the order they are given. The output (one or more
plots) may be piped to another program or redirected to a file.
Usually, however, we direct the output explicitly with an instruction
to GNUPLOT (the set output command). GNUPLOT continues to print
error messages to the terminal (stderr).
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David.Kotz@dartmouth.edu