Graphics

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Graphics
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The commands for graphing data begin with the `g' prefix key.  Calc
uses GNUPLOT 2.0 or 3.0 to do graphics.  These commands will only work
if GNUPLOT is available on your system.  (While GNUPLOT sounds like a
relative of GNU Emacs, it is actually completely unrelated.  However,
it is free software and can be obtained from the Free Software
Foundation's machine `prep.ai.mit.edu'.)

If you have GNUPLOT installed on your system but Calc is unable to
find it, you may need to set the `calc-gnuplot-name' variable in your
`.emacs' file.  You may also need to set some Lisp variables to show
Calc how to run GNUPLOT on your system; these are described under `g
D' and `g O' below.  If you are using the X window system, Calc will
configure GNUPLOT for you automatically.  If you have GNUPLOT 3.0 and
you are not using X, Calc will configure GNUPLOT to display graphs
using simple character graphics that will work on any terminal.
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