detecting missing arguments in latex

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Article #2572

#2572

From: Gregory Lampshire
Date: Fri, 11 Sep 1992 16:04

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I want to set up a macro where the presence of an argument will be  
significant, that is

\newcommand\fig[3]{
	\if <argument #1 is null> do this etc.
	\else etc.
	\fi
}


\fig{}{}{this is a phrase}

is different from

\fig{2}{3}{this is a phrase}



How do I test to see if an argument is null?  I tried


\csname the #1 \endcsname but that naturally didn't work since the  
argument is not a counter, register etc..




--
Gregory Lampshire 
Virginia Tech NeXT CC
Bradley Department of Electrical Engineering
gbol@rglnext.geol.vt.edu (NeXTmail welcome)
------------------------
My opinions are my very own and do not reflect the opinions of any  
employer

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Path: arc1-ca.pugleaf.net!sparky!uunet!vtserf!rglnext.geol.vt.edu
From: gbol@rglnext.geol.vt.edu (Gregory Lampshire)
Newsgroups: comp.text.tex
Subject: detecting missing arguments in latex
Message-ID: <6725@vtserf.cc.vt.edu>
Date: 11 Sep 92 16:04:03 GMT
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