Many of the things one plots with gnuplot are associated with special
characters, such as superscript for powers, and Greek letters for physical
measures (see my web page on plotting a sine wave
for an example of using Greek symbols). To enable support for these characters
in gnuplot, it is necessary to use the enabled option of the
set terminal command. For instance, to include the expression for
the area of a circle in the title of a plot, you'd use something like the
following:
set terminal wxt enhanced font "arial,14"
set title fn
set xlabel "Surface Area (metres^{2})"
Note, however, that this can cause unexpected problems where the special
characters are meant to be treated literally, as depicted above where the first
"a" in "area" in the title is shown as a subscript because of the underscore in
the file name. For instance, the underscore
character is used to generate subscript characters, but it is often used in file
names, so if you had a file name my_data.tsv and wanted to show that
name in the title, but still have enhanced characters elsewhere in the plot,
you'd need to turn off the enhanced option for the set
title command. For example:
set terminal wxt enhanced font "arial,14"
set title fn noenhanced
set xlabel "Surface Area (metres^{2})"
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Content last updated: 2012-02-20