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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">¶</a></h1>
<p>The options below control the operation of the TeX input processor
that is run when you include <code class="docutils literal"><span class="pre">"input/TeX"</span></code> in the <cite>jax</cite> array of
your configuration or load a combined configuration file that includes
the TeX input jax. They are listed with their default values. To
set any of these options, include a <code class="docutils literal"><span class="pre">TeX</span></code> section in your
<code class="xref py py-meth docutils literal"><span class="pre">MathJax.Hub.Config()</span></code> call. For example</p>
<div class="highlight-javascript"><div class="highlight"><pre><span></span><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 <code class="docutils literal"><span class="pre">Macros</span></code> configuration option to cause two new macros
to be defined within the TeX input processor.</p>
<dl class="describe">
<dt>
<code class="descname">TagSide: "right"</code></dt>
<dd><p>This specifies the side on which <code class="docutils literal"><span class="pre">\tag{}</span></code> macros will place the
tags. Set it to <code class="docutils literal"><span class="pre">"left"</span></code> to place the tags on the left-hand side.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">TagIndent: ".8em"</code></dt>
<dd><p>This is the amount of indentation (from the right or left) for the
tags produced by the <code class="docutils literal"><span class="pre">\tag{}</span></code> macro.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">MultLineWidth: "85%"</code></dt>
<dd><p>The width to use for the <cite>multline</cite> environment that is part of
the <code class="docutils literal"><span class="pre">AMSmath</span></code> 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>
<code class="descname">equationNumbers: {}</code></dt>
<dd><p>This object controls the automatic equation numbering and the
equation referencing. It contains the following values:</p>
<dl class="describe">
<dt>
<code class="descname">autoNumber: "none"</code></dt>
<dd><p>This controls whether equations are numbered and how. By
default it is set to <code class="docutils literal"><span class="pre">"none"</span></code> to be compatible with earlier
versions of MathJax where auto-numbering was not performed (so
pages will not change their appearance). You can change
this to <code class="docutils literal"><span class="pre">"AMS"</span></code> for equations numbered as the <cite>AMSmath</cite>
package would do, or <code class="docutils literal"><span class="pre">"all"</span></code> to get an equation number for
every displayed equation.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">formatNumber: function (n) {return n}</code></dt>
<dd><p>A function that tells MathJax what tag to use for equation
number <code class="docutils literal"><span class="pre">n</span></code>. This could be used to have the equations labeled
by a sequence of symbols rather than numbers, or to use section
and subsection numbers instead.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">formatTag: function (n) {return '('+n+')'}</code></dt>
<dd><p>A function that tells MathJax how to format an equation number
for displaying as a tag for an equation. This is what appears
in the margin of a tagged or numbered equation.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">formatID: function {return 'mjx-eqn-'+String(n).replace(/[:'"<>&]/g,"")}</code></dt>
<dd><p>A function that rells MathJax what ID to use as an anchor for
the equation (so that it can be used in URL references).</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">formatURL: function (id) {return '#'+escape(id)}</code></dt>
<dd><p>A function that takes an equation ID and returns the URL to
link to it.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">useLabelIds: true</code></dt>
<dd><p>This controls whether element ID’s use the <code class="docutils literal"><span class="pre">\label</span></code> name or
the equation number. When <code class="docutils literal"><span class="pre">true</span></code>, use the label, when
<code class="docutils literal"><span class="pre">false</span></code>, use the equation number.</p>
</dd></dl>
<p>See the <a class="reference external" href="https://github.com/mathjax/MathJax/blob/master/test/examples.html">MathJax examples page</a> for
some examples of equation numbering.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">Macros: {}</code></dt>
<dd><p>This lists macros to define before the TeX input processor begins.
These are <cite>name:value</cite> 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> can be 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></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>
</pre></div>
</div>
<p>would ask the TeX processor to define two new macros: <code class="docutils literal"><span class="pre">\RR</span></code>,
which produces a bold-face “R”, and <code class="docutils literal"><span class="pre">\bold{...}</span></code>, which takes one
parameter and sets it in the bold-face font.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">MAXMACROS: 10000</code></dt>
<dd><p>Because a definition of the form <code class="docutils literal"><span class="pre">\def\x{\x}</span> <span class="pre">\x</span></code> would cause MathJax
to loop infinitely, the <cite>MAXMACROS</cite> constant will limit the number of
macro substitutions allowed in any expression processed by MathJax.</p>
</dd></dl>
<dl class="describe">
<dt>
<code class="descname">MAXBUFFER: 5*1024</code></dt>
<dd><p>Because a definition of the form <code class="docutils literal"><span class="pre">\def\x{\x</span> <span class="pre">aaa}</span> <span class="pre">\x</span></code> 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>
</div>
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