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<a name="LIndex"></a>
<div class="header">
<p>
Next: <a href="Table-of-Contents.html#Table-of-Contents" accesskey="n" rel="next">Table of Contents</a>, Previous: <a href="Sections.html#Sections" accesskey="p" rel="prev">Sections</a>, Up: <a href="LaTeX.html#LaTeX" accesskey="u" rel="up">LaTeX</a> &nbsp; [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>

<a name="LaTeX_0027s-index_002e"></a>
<h4 class="subsubsection">10.1.3.5 LaTeX&rsquo;s index.</h4>

<a name="index-Index-1"></a>
<a name="index-_005cINDEX-1"></a>
<a name="index-_005cbeforeindex"></a>
<a name="index-_005cstartindex"></a>
<a name="index-_005cWfin"></a>
<p>The Index should be the last section of the code, and should be begun by the command &lsquo;<samp>@* \INDEX.</samp>&rsquo;.  For more
information, see <a href="S_005findex.html#S_005findex">S_index</a>.
</p>
<p>The challenge of typesetting the Index is to get it into two-column mode
in the best possible way.  In the original Plain-TeX <small>FWEB</small>,
special code was provided for this.  With LaTeX, however, one wants
to use standard features.
</p>
<a name="index-multicol_002c-using"></a>
<a name="index-Package_002c-multicol"></a>
<a name="index-multicol_002esty"></a>
<a name="index-_005ctwocolumn"></a>
<p>The best solution is to use the user package <code>multicol</code>.  If that
is loaded by means of the style-file statement &lsquo;<samp>LaTeX.package
&quot;multicol&quot;</samp>&rsquo;, then any text typed by the user following the &lsquo;<samp>@*
\INDEX.</samp>&rsquo; command will 
be typeset in single-column mode, after which two-column mode is
entered.  If it is not loaded, a &lsquo;<samp>\twocolumn</samp>&rsquo; command is issued
<em>before</em> the index section is begun (in order to get the Index
started on a new page).  
</p>
<p>More precisely, what happens is the following.  When the &lsquo;<samp>@*
\INDEX.</samp>&rsquo; command is recognized, essentially the following operations are
performed, where the results are bracketed in the form &lsquo;<samp>[multicol :
nomulticol]</samp>&rsquo;:  
</p>
<div class="example">
<pre class="example">\beforeindex [\newpage : \twocolumn]
[print INDEX section heading]
\startindex  [\begin{multicols}{2} : \medskip]
\Wfin        [\end{multicols} : \relax]
</pre></div>
<p>(Use of the asymmetrical name &lsquo;<samp>\Wfin</samp>&rsquo; is for historical reasons.)
</p>
<a name="index-Columns_002c-multiple"></a>
<p>The positioning of &lsquo;<samp>\beforeindex</samp>&rsquo; suggests a way of printing the
entire document in two-column mode.  If one enters multi-column mode in
the limbo section, then &lsquo;<samp>\beforeindex</samp>&rsquo; can be used to terminate it.
It is best to do this at the <em>end</em> of the limbo section; otherwise
user macro definitions in the limbo section must be made <code>\global</code> in order
that they remain defined in the Index.  The relevant commands can be
placed in the style file:
</p>
<div class="example">
<pre class="example">LaTeX.package &quot;multicol&quot;

doc.preamble &quot;\\secpenalty=0&quot;

limbo.end &quot;\\def\\beforeindex{\\end{multicols}\\newpage}\n\
\\begin{multicols}{2}\n\
\\raggedcolumns&quot;
</pre></div>
<p>Just to repeat, use only the first command to get just the Index printed
in two-column format; use the second and third ones to make the entire
document two-column.
</p>
<hr>
<div class="header">
<p>
Next: <a href="Table-of-Contents.html#Table-of-Contents" accesskey="n" rel="next">Table of Contents</a>, Previous: <a href="Sections.html#Sections" accesskey="p" rel="prev">Sections</a>, Up: <a href="LaTeX.html#LaTeX" accesskey="u" rel="up">LaTeX</a> &nbsp; [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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