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<title>UK TeX FAQ -- question label oarglikesect</title>
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<h3>Optional arguments like <code>\</code><code>section</code></h3>
<p>Optional arguments, in macros defined using <code>\</code><code>newcommand</code>, don't
quite work like the optional argument to <code>\</code><code>section</code>. The default
value of <code>\</code><code>section</code>'s optional argument is the value of the
mandatory argument, but <code>\</code><code>newcommand</code> requires that you 'know' the
value of the default beforehand.
<p>The requisite trick is to use a macro in the optional argument:
<pre>
\newcommand\thing[2][\DefaultOpt]{\def\DefaultOpt{#2} ...}
</pre>
<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=oarglikesect">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=oarglikesect</a>
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