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<div class="section" id="the-tex-input-processor">
<span id="configure-tex"></span><h1>The TeX input processor<a class="headerlink" href="#the-tex-input-processor" title="Permalink to this headline">ΒΆ</a></h1>
<p>The options below control the operation of the TeX input processor
that is run when you include <tt class="docutils literal"><span class="pre">"input/TeX"</span></tt> in the <cite>jax</cite> array of
your configuration. They are listed with their default values. To
set any of these options, include a <tt class="docutils literal"><span class="pre">TeX</span></tt> section in your
<tt class="xref py py-meth docutils literal"><span class="pre">MathJax.Hub.Config()</span></tt> call. For example</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="nx">MathJax</span><span class="p">.</span><span class="nx">Hub</span><span class="p">.</span><span class="nx">Config</span><span class="p">({</span>
<span class="nx">TeX</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">Macros</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">RR</span><span class="o">:</span> <span class="s1">'{\\bf R}'</span><span class="p">,</span>
<span class="nx">bold</span><span class="o">:</span> <span class="p">[</span><span class="s1">'{\\bf #1}'</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">});</span>
</pre></div>
</div>
<p>would set the <tt class="docutils literal"><span class="pre">Macros</span></tt> configuration option to cause two new macros
to be defined within the TeX input processor.</p>
<dl class="describe">
<dt>
<tt class="descname">TagSide: "right"</tt></dt>
<dd><p>This specifies the side on which <tt class="docutils literal"><span class="pre">\tag{}</span></tt> macros will place the
tags. Set it to <tt class="docutils literal"><span class="pre">"left"</span></tt> to place the tags on the left-hand side.</p>
</dd></dl>
<dl class="describe">
<dt>
<tt class="descname">TagIndent: ".8em"</tt></dt>
<dd><p>This is the amount of indentation (from the right or left) for the
tags produced by the <tt class="docutils literal"><span class="pre">\tag{}</span></tt> macro.</p>
</dd></dl>
<dl class="describe">
<dt>
<tt class="descname">MultLineWidth: "85%"</tt></dt>
<dd><p>The width to use for the <cite>multline</cite> environment that is part of
the <tt class="docutils literal"><span class="pre">AMSmath</span></tt> extension. This width gives room for tags at
either side of the equation, but if you are displaying mathematics
in a small area or a thin column of text, you might need to change
the value to leave sufficient margin for tags.</p>
</dd></dl>
<dl class="describe">
<dt>
<tt class="descname">Macros: {}</tt></dt>
<dd><p>This lists macros to define before the TeX input processor begins.
These are name:value pairs where the <cite>name</cite> gives the name of the TeX
macro to be defined, and <cite>value</cite> gives the replacement text for the
macro. The <cite>value</cite> canbe an array of the form <cite>[value,n]</cite>, where
<cite>value</cite> is the replacement text and <cite>n</cite> is the number of parameters
for the macro. Note that since the <cite>value</cite> is a javascript string,
backslashes in the replacement text must be doubled to prevent them
from acting as javascript escape characters.</p>
<p>For example,</p>
<div class="highlight-javascript"><div class="highlight"><pre><span class="nx">Macros</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">RR</span><span class="o">:</span> <span class="s1">'{\\bf R}'</span><span class="p">,</span>
<span class="nx">bold</span><span class="o">:</span> <span class="p">[</span><span class="s1">'{\\bf #1}'</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
<span class="p">}</span>
</pre></div>
</div>
<p>would ask the TeX processor to define two new macros: <tt class="docutils literal"><span class="pre">\RR</span></tt>,
which produces a bold-face “R”, and <tt class="docutils literal"><span class="pre">\bold{...}</span></tt>, which takes one
parameter and set it in the bold-face font.</p>
</dd></dl>
<dl class="describe">
<dt>
<tt class="descname">MAXMACROS: 10000</tt></dt>
<dd><p>Because a definition of the form <tt class="docutils literal"><span class="pre">\def\x{\x}</span> <span class="pre">\x</span></tt> would cause MathJax
to loop infinitely, the <cite>MAXMACROS</cite> constant will limit the nuber of
macro substitutions allowed in any expression processed by MathJax.</p>
</dd></dl>
<dl class="describe">
<dt>
<tt class="descname">MAXBUFFER: 5*1024</tt></dt>
<dd><p>Because a definition of the form <tt class="docutils literal"><span class="pre">\def\x{\x</span> <span class="pre">aaa}</span> <span class="pre">\x</span></tt> would loop
infinitely, and at the same time stack up lots of a’s in MathJax’s
equation buffer, the <cite>MAXBUFFER</cite> constant is used to limit the size of
the string being processed by MathJax. It is set to 5KB, which should
be sufficient for any reasonable equation.</p>
</dd></dl>
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