Re: [NTG-context] Determing if the argument is one character or not

3 Feb 2009


      Aditya Mahajan wrote:
...
Hi,
I want to write a macro which behaves differently depending on whether 
its argumet is a single character or not.
\MACRO[a] should give $X_{a}$
\MACRO[a:b] should give $X_{[a:b]}$
Any hints on how to do this?
\def\MACRO[#1#2]%
   {\doifelsenothing{#2}
      {$X_{#1}$}
      {$X_{[#1#2]}$}}


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