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<title>Use of the interpreter Property (GNU Octave (version 6.2.0))</title>
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<span id="Use-of-the-interpreter-Property"></span><div class="header">
<p>
Next: <a href="Printing-and-Saving-Plots.html" accesskey="n" rel="next">Printing and Saving Plots</a>, Previous: <a href="Manipulation-of-Plot-Windows.html" accesskey="p" rel="prev">Manipulation of Plot Windows</a>, Up: <a href="High_002dLevel-Plotting.html" accesskey="u" rel="up">High-Level Plotting</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Use-of-the-interpreter-Property-1"></span><h4 class="subsection">15.2.8 Use of the <code>interpreter</code> Property</h4>
<span id="XREFinterpreterusage"></span>
<p>All text objects—such as titles, labels, legends, and text—include
the property <code>"interpreter"</code> that determines the manner in
which special control sequences in the text are rendered.
</p>
<p>The interpreter property can take three values: <code>"none"</code>, <code>"tex"</code>,
<code>"latex"</code>. If the interpreter is set to <code>"none"</code> then no special
rendering occurs—the displayed text is a verbatim copy of the specified text.
Currently, the <code>"latex"</code> interpreter is not implemented for on-screen
display and is equivalent to <code>"none"</code>. Note that Octave does not parse
or validate the text strings when in <code>"latex"</code> mode—it is the
responsibility of the programmer to generate valid strings which may include
wrapping sections that should appear in Math mode with <code>'$'</code> characters.
</p>
<p>The <code>"tex"</code> option implements a subset of TeX functionality when
rendering text. This allows the insertion of special glyphs such as Greek
characters or mathematical symbols. Special characters are inserted by using
a backslash (\) character followed by a code, as shown in <a href="#tab_003aextended">Table 15.1</a>.
</p>
<p>Besides special glyphs, the formatting of the text can be changed within the
string by using the codes
</p>
<table>
<tr><td width="20%"></td><td width="20%">\bf</td><td width="60%">Bold font</td><td width="20%"></td></tr>
<tr><td width="20%"></td><td width="20%">\it</td><td width="60%">Italic font</td><td width="20%"></td></tr>
<tr><td width="20%"></td><td width="20%">\sl</td><td width="60%">Oblique Font</td><td width="20%"></td></tr>
<tr><td width="20%"></td><td width="20%">\rm</td><td width="60%">Normal font</td><td width="20%"></td></tr>
</table>
<p>These codes may be used in conjunction with the { and } characters to limit
the change to a part of the string. For example,
</p>
<div class="example">
<pre class="example">xlabel ('{\bf H} = a {\bf V}')
</pre></div>
<p>where the character <code>'a'</code> will not appear in bold font. Note that to
avoid having Octave interpret the backslash character in the strings,
the strings themselves should be in single quotes.
</p>
<p>It is also possible to change the fontname and size within the text
</p>
<table>
<tr><td width="10%"></td><td width="40%">\fontname{<var>fontname</var>}</td><td width="60%">Specify the font to use</td><td width="10%"></td></tr>
<tr><td width="10%"></td><td width="40%">\fontsize{<var>size</var>}</td><td width="60%">Specify the size of the font to
use</td><td width="10%"></td></tr>
</table>
<p>The color of the text may also be changed inline using either a string (e.g.,
"red") or numerically with a Red-Green-Blue (RGB) specification (e.g.,
[1 0 0], also red).
</p>
<table>
<tr><td width="10%"></td><td width="40%">\color{<var>color</var>}</td><td width="60%">Specify the color as a string</td><td width="10%"></td></tr>
<tr><td width="10%"></td><td width="40%">\color[rgb]{<var>R</var> <var>G</var> <var>B</var>}</td><td width="60%">Specify the color
numerically</td><td width="10%"></td></tr>
</table>
<p>Finally, superscripting and subscripting can be controlled with the <code>'^'</code>
and <code>'_'</code> characters. If the <code>'^'</code> or <code>'_'</code> is followed by a
{ character, then all of the block surrounded by the { }<!-- /@w --> pair is
superscripted or subscripted. Without the { }<!-- /@w --> pair, only the character
immediately following the <code>'^'</code> or <code>'_'</code> is changed.
</p>
<div class="float"><span id="tab_003aextended"></span>
<table>
<tr><td width="25%">Greek Lowercase Letters</td></tr>
<tr><td width="25%"></td><td width="25%">\alpha</td><td width="25%">\beta</td><td width="25%">\gamma</td></tr>
<tr><td width="25%"></td><td width="25%">\delta</td><td width="25%">\epsilon</td><td width="25%">\zeta</td></tr>
<tr><td width="25%"></td><td width="25%">\eta</td><td width="25%">\theta</td><td width="25%">\vartheta</td></tr>
<tr><td width="25%"></td><td width="25%">\iota</td><td width="25%">\kappa</td><td width="25%">\lambda</td></tr>
<tr><td width="25%"></td><td width="25%">\mu</td><td width="25%">\nu</td><td width="25%">\xi</td></tr>
<tr><td width="25%"></td><td width="25%">\o</td><td width="25%">\pi</td><td width="25%">\varpi</td></tr>
<tr><td width="25%"></td><td width="25%">\rho</td><td width="25%">\sigma</td><td width="25%">\varsigma</td></tr>
<tr><td width="25%"></td><td width="25%">\tau</td><td width="25%">\upsilon</td><td width="25%">\phi</td></tr>
<tr><td width="25%"></td><td width="25%">\chi</td><td width="25%">\psi</td><td width="25%">\omega</td></tr>
<tr><td width="25%">Greek Uppercase Letters</td></tr>
<tr><td width="25%"></td><td width="25%">\Gamma</td><td width="25%">\Delta</td><td width="25%">\Theta</td></tr>
<tr><td width="25%"></td><td width="25%">\Lambda</td><td width="25%">\Xi</td><td width="25%">\Pi</td></tr>
<tr><td width="25%"></td><td width="25%">\Sigma</td><td width="25%">\Upsilon</td><td width="25%">\Phi</td></tr>
<tr><td width="25%"></td><td width="25%">\Psi</td><td width="25%">\Omega</td><td width="25%"></td></tr>
<tr><td width="25%">Misc Symbols Type Ord</td></tr>
<tr><td width="25%"></td><td width="25%">\aleph</td><td width="25%">\wp</td><td width="25%">\Re</td></tr>
<tr><td width="25%"></td><td width="25%">\Im</td><td width="25%">\partial</td><td width="25%">\infty</td></tr>
<tr><td width="25%"></td><td width="25%">\prime</td><td width="25%">\nabla</td><td width="25%">\surd</td></tr>
<tr><td width="25%"></td><td width="25%">\angle</td><td width="25%">\forall</td><td width="25%">\exists</td></tr>
<tr><td width="25%"></td><td width="25%">\neg</td><td width="25%">\clubsuit</td><td width="25%">\diamondsuit</td></tr>
<tr><td width="25%"></td><td width="25%">\heartsuit</td><td width="25%">\spadesuit</td><td width="25%"></td></tr>
<tr><td width="25%">“Large” Operators</td></tr>
<tr><td width="25%"></td><td width="25%">\int</td></tr>
<tr><td width="25%">Binary Operators</td></tr>
<tr><td width="25%"></td><td width="25%">\pm</td><td width="25%">\cdot</td><td width="25%">\times</td></tr>
<tr><td width="25%"></td><td width="25%">\ast</td><td width="25%">\circ</td><td width="25%">\bullet</td></tr>
<tr><td width="25%"></td><td width="25%">\div</td><td width="25%">\cap</td><td width="25%">\cup</td></tr>
<tr><td width="25%"></td><td width="25%">\vee</td><td width="25%">\wedge</td><td width="25%">\oplus</td></tr>
<tr><td width="25%"></td><td width="25%">\otimes</td><td width="25%">\oslash</td><td width="25%"></td></tr>
<tr><td width="25%">Relations</td></tr>
<tr><td width="25%"></td><td width="25%">\leq</td><td width="25%">\subset</td><td width="25%">\subseteq</td></tr>
<tr><td width="25%"></td><td width="25%">\in</td><td width="25%">\geq</td><td width="25%">\supset</td></tr>
<tr><td width="25%"></td><td width="25%">\supseteq</td><td width="25%">\ni</td><td width="25%">\mid</td></tr>
<tr><td width="25%"></td><td width="25%">\equiv</td><td width="25%">\sim</td><td width="25%">\approx</td></tr>
<tr><td width="25%"></td><td width="25%">\cong</td><td width="25%">\propto</td><td width="25%">\perp</td></tr>
<tr><td width="25%">Arrows</td></tr>
<tr><td width="25%"></td><td width="25%">\leftarrow</td><td width="25%">\Leftarrow</td><td width="25%">\rightarrow</td></tr>
<tr><td width="25%"></td><td width="25%">\Rightarrow</td><td width="25%">\leftrightarrow</td><td width="25%">\uparrow</td></tr>
<tr><td width="25%"></td><td width="25%">\downarrow</td><td width="25%"></td><td width="25%"></td></tr>
<tr><td width="25%">Openings and Closings</td></tr>
<tr><td width="25%"></td><td width="25%">\lfloor</td><td width="25%">\langle</td><td width="25%">\lceil</td></tr>
<tr><td width="25%"></td><td width="25%">\rfloor</td><td width="25%">\rangle</td><td width="25%">\rceil</td></tr>
<tr><td width="25%">Alternate Names</td></tr>
<tr><td width="25%"></td><td width="25%">\neq</td></tr>
<tr><td width="25%">Other</td></tr>
<tr><td width="25%"></td><td width="25%">\ldots</td><td width="25%">\0</td><td width="25%">\copyright</td></tr>
<tr><td width="25%"></td><td width="25%">\deg</td></tr>
</table>
<div class="float-caption"><p><strong>Table 15.1: </strong>Available special characters in TeX mode</p></div></div><div class="float">
</div>
<span id="Degree-Symbol"></span><h4 class="subsubsection">15.2.8.1 Degree Symbol</h4>
<span id="index-Degree-Symbol"></span>
<p>Conformance to both TeX and <small>MATLAB</small> with respect to the <code>\circ</code>
symbol is impossible. While TeX translates this symbol to Unicode 2218<!-- /@w -->
(U+2218), <small>MATLAB</small> maps this to Unicode 00B0<!-- /@w --> (U+00B0) instead. Octave
has chosen to follow the TeX specification, but has added the additional
symbol <code>\deg</code> which maps to the degree symbol (U+00B0).
</p>
<hr>
<div class="header">
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