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<h4 class="subsubsection" id="g_t_0022latex_0022-interpreter-1"><span>15.2.8.3 "latex" interpreter<a class="copiable-link" href="#g_t_0022latex_0022-interpreter-1"> ¶</a></span></h4>
<p>The <code class="code">"latex"</code> interpreter only works if an external LaTeX tool chain
is present. Three binaries are needed: <code class="code">latex</code>, <code class="code">dvipng</code>, and
<code class="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 class="env">OCTAVE_LATEX_BINARY</code><!-- /@w -->, <code class="env">OCTAVE_DVIPNG_BINARY</code><!-- /@w -->, and
<code class="env">OCTAVE_DVISVG_BINARY</code><!-- /@w -->.
</p>
<p>Note that Octave does not parse or validate the text strings when in
<code class="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 class="code">'$'</code> characters.
See, for example, <a class="url" 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 class="env">OCTAVE_LATEX_DEBUG_FLAG</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 class="code">"x^2"</code> is not a valid LaTeX string and the following
example should fail
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">setenv ("OCTAVE_LATEX_DEBUG_FLAG", "1")
x = 1:10;
plot (x, x.^2)
title ("x^2", "interpreter", "latex")
</pre></div></div>
<p>Searching the terminal output you should find some helpful info about the
origin of the failure:
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">...
No file default.aux.
! Missing $ inserted.
<inserted text>
$
l.6 x^
2
! Missing $ inserted.
...
</pre></div></div>
<p>If no usable LaTeX tool chain is found at the first text rendering, using
the <code class="code">"latex"</code> interpreter is equivalent to <code class="code">"none"</code>.
</p>
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