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<head>
<title>UK TeX FAQ -- question label running-nos</title>
</head><body>
<h3>Running equation, figure and table numbering</h3>
<p/>Many LaTeX classes (including the standard <i>book</i> class)
number things per chapter; so figures in chapter 1 are numbered 1.1,
1.2, and so on. Sometimes this is not appropriate for the user’s
needs.
<p/>Short of rewriting the whole class, one may use the <i>chngctr</i>
package, which provides commands <code>\</code><code>counterwithin</code> (which
establishes this nested numbering relationship) and
<code>\</code><code>counterwithout</code> (which undoes it).
<p/>So if you have figures numbered by chapter as 1.1, 1.2, 2.1, ...,
the command
<blockquote>
<pre>
\counterwithout{figure}{chapter}
</pre>
</blockquote><p>
will convert them to figures 1, 2, 3, .... (Note that the command
has also removed the chapter number from the counter’s definition.)
<p/>More elaborate use could change things numbered per section to things
numbered per chapter:
<blockquote>
<pre>
\counterwithout{equation}{section}
\counterwithin{equation}{chapter}
</pre>
</blockquote><p>
(assuming there was a class that did such a thing in the first place...)
<p/>The <i>chngcntr</i> approach doesn’t involve much programming, and
the enthusiastic LaTeX programmer might choose to try the technique
that we had to use before the advent of <i>chngcntr</i>. Each of
the packages <i>removefr</i> and <i>remreset</i> defines a
<code>\</code><code>@removefromreset</code> command, and having included the package one
writes something like:
<blockquote>
<pre>
\makeatletter
\@removefromreset{figure}{chapter}
\makeatother
</pre>
</blockquote><p>
and the automatic renumbering stops. You may then need to redefine the
way in which the figure number (in this case) is printed:
<blockquote>
<pre>
\makeatletter
\renewcommand{\thefigure}{\@arabic\c@figure}
\makeatother
</pre>
</blockquote><p>
(remember to do the whole job, for every counter you want to
manipulate, within <code>\</code><code>makeatletter</code> ... <code>\</code><code>makeatother</code>).
<p/>This technique, too, may be used to change where in a multilevel
structure a counter is reset. Suppose your class numbers figures as
<<i>chapter</i>>.<<i>section</i>>.<<i>figure</i>>, and you want figures
numbered per chapter, try:
<blockquote>
<pre>
\makeatletter
\@removefromreset{figure}{section}
\@addtoreset{figure}{chapter}
\renewcommand{\thefigure}{\thechapter.\@arabic\c@figure}
\makeatother
</pre>
</blockquote><p>
(the command <code>\</code><code>@addtoreset</code> is a part of LaTeX itself).
<dl>
<dt><tt><i>chngcntr.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/misc/chngcntr.sty">macros/latex/contrib/misc/chngcntr.sty</a>
<dt><tt><i>memoir.cls</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/memoir.zip">macros/latex/contrib/memoir</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/memoir.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/memoir/">browse</a>)
<dt><tt><i>removefr.tex</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/fragments/removefr.tex">macros/latex/contrib/fragments/removefr.tex</a> (note, this is constructed as a
“fragment” for use within other packages: load by
<code>\</code><code>input{removefr}</code>)
<dt><tt><i>remreset.sty</i></tt><dd>Distributed as part of <a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/carlisle.zip">macros/latex/contrib/carlisle</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/carlisle.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/carlisle/">browse</a>)
</dl>
<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=running-nos">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=running-nos</a>
</body>
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