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<div class="subsubsection" id="latex-interpreter">
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<p>
Previous: <a href="tex-interpreter.html" accesskey="p" rel="prev"><code>tex</code> interpreter</a>, Up: <a href="Use-of-the-interpreter-Property.html" accesskey="u" rel="up">Use of the <code>interpreter</code> Property</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>
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<hr>
<span id="latex-interpreter-1"></span><h4 class="subsubsection">15.2.8.3 <code>latex</code> interpreter</h4>
<span id="XREFlatexinterpreter"></span><p>The <code>"latex"</code> interpreter only works if an external LaTeX tool chain
is present. Three binaries are needed: <code>latex</code>, <code>dvipng</code>, and
<code>dvisvgm</code>. If those binaries are installed but not on the path, one can
still provide their respective path using the following environment variables:
<code><span class="nolinebreak">OCTAVE_LATEX_BINARY</span></code><!-- /@w -->, <code><span class="nolinebreak">OCTAVE_DVIPNG_BINARY</span></code><!-- /@w -->, and
<code><span class="nolinebreak">OCTAVE_DVISVG_BINARY</span></code><!-- /@w -->.
</p>
<p>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.
See, for example, <a href="https://www.latex-project.org/help/documentation/">https://www.latex-project.org/help/documentation/</a> for
documentation about LaTeX typesetting.
</p>
<p>For debugging purpose, a convenience environment variable,
<code><span class="nolinebreak">OCTAVE_LATEX_DEBUG_FLAG</span></code><!-- /@w -->, can be set to trigger more verbose output
when Octave fails to have a given text compiled by an external LaTeX engine.
For example, <code>"x^2"</code> is not a valid LaTeX string and the following
example should fail
</p>
<div class="example">
<pre class="example">setenv ("OCTAVE_LATEX_DEBUG_FLAG", "1")
x = 1:10;
plot (x, x.^2)
title ("x^2", "interpreter", "latex")
</pre></div>
<p>Searching the terminal output you should find some helpful info about the
origin of the failure:
</p>
<div class="example">
<pre class="example">...
No file default.aux.
! Missing $ inserted.
<inserted text>
$
l.6 x^
2
! Missing $ inserted.
...
</pre></div>
<p>If no usable LaTeX tool chain is found at the first text rendering, using
the <code>"latex"</code> interpreter is equivalent to <code>"none"</code>.
</p>
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