GNUPlot Manual
GNUPlot Manual
GNUPlot Manual
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36 SET-SHOW gnuplot 4.0 127<br />
Several possibly useful files about gnuplot’s PostScript are included in the /docs/psdoc subdirectory of<br />
the gnuplot distribution and at the distribution sites. These are "ps symbols.gpi" (a gnuplot command<br />
file that, when executed, creates the file "ps symbols.ps" which shows all the symbols available through<br />
the postscript terminal), "ps guide.ps" (a PostScript file that contains a summary of the enhanced<br />
syntax and a page showing what the octal codes produce with text and symbol fonts), "ps file.doc" (a<br />
text file that contains a discussion of the organization of a PostScript file written by gnuplot), and<br />
"ps fontfile doc.tex" (a LaTeX file which contains a short documentation concerning the encapsulation<br />
of LaTeX fonts with a glyph table of the math fonts).<br />
A PostScript file is editable, so once gnuplot has created one, you are free to modify it to your heart’s<br />
desire. See the editing postscript (p. 128) section for some hints.<br />
36.59.55.1 Enhanced postscript Several terminal types support an enhanced text mode in which<br />
additional formatting information is embedded in the text string.<br />
Enhanced Text Control Codes<br />
Control Examples Explanation<br />
^ a^x superscript<br />
_ a_x subscript<br />
@ @x or a@^b_c phantom box (occupies no width)<br />
& &{space} inserts space of specified length<br />
~ ~a{.8-} overprints ’-’ on ’a’, raised by .8<br />
times the current fontsize<br />
Braces can be used to place multiple-character text where a single character is expected (e.g., 2^{10}).<br />
To change the font and/or size, use the full form: {/[fontname][=fontsize | *fontscale] text}. Thus<br />
{/Symbol=20 G} is a 20-point GAMMA and {/*0.75 K} is a K at three-quarters of whatever fontsize<br />
is currently in effect. (The ’/’ character MUST be the first character after the ’{’.)<br />
If the encoding vector has been changed by set encoding, the default encoding vector can be used<br />
instead by following the slash with a dash. This is unnecessary if you use the Symbol font, however —<br />
since /Symbol uses its own encoding vector, gnuplot will not apply any other encoding vector to it.<br />
The phantom box is useful for a@^b c to align superscripts and subscripts but does not work well for<br />
overwriting an accent on a letter. (To do the latter, it is much better to use ’set encoding iso 8859 1’<br />
to change to the ISO Latin-1 encoding vector, which contains a large variety of letters with accents or<br />
other diacritical marks.) Since the box is non-spacing, it is sensible to put the shorter of the subscript<br />
or superscript in the box (that is, after the @).<br />
Space equal in length to a string can be inserted using the ’&’ character. Thus<br />
’abc&{def}ghi’<br />
would produce<br />
’abc<br />
ghi’.<br />
The ’˜ ’ character causes the next character or bracketed text to be overprinted by the following character<br />
or bracketed text. The second text will be horizontally centered on the first. Thus ’˜ a/’ will result in<br />
an ’a’ with a slash through it. You can also shift the second text vertically by preceding the second text<br />
with a number, which will define the fraction of the current fontsize by which the text will be raised or<br />
lowered. In this case the number and text must be enclosed in brackets because more than one character<br />
is necessary. If the overprinted text begins with a number, put a space between the vertical offset and<br />
the text (’˜ {abc}{.5 000}’); otherwise no space is needed (’˜ {abc}{.5 — }’). You can change the font<br />
for one or both strings (’˜ a{.5 /*.2 o}’ — an ’a’ with a one-fifth-size ’o’ on top — and the space between<br />
the number and the slash is necessary), but you can’t change it after the beginning of the string. Neither<br />
can you use any other special syntax within either string. You can, of course, use control characters by<br />
escaping them (see below), such as ’˜ a{\^}’<br />
You can access special symbols numerically by specifying \character-code (in octal), e.g., {/Symbol<br />
\245} is the symbol for infinity.