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## 13 Graphics

The commands for graphing data begin with the `g` prefix key. Calc uses GNUPLOT 2.0 or later 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. It can be obtained from ‘`http://www.gnuplot.info`’.)

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 Calc init file or `.emacs`. 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 or MS-Windows, Calc will configure GNUPLOT for you automatically. If you have GNUPLOT 3.0 or later and you are using a Unix or GNU system without X, Calc will configure GNUPLOT to display graphs using simple character graphics that will work on any Posix-compatible terminal.