doifnumberelse

doifnumberelse

[Hans van der Meer]

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The macro \doifnumberelse is not behaving as I would have expected  
from the description in Taco Hoekwater's article "Context System  
Macros: part 1: General macros".
There I read:
   The next macro executesa command depending of the outcome of a test  
on numerals.
   \doifnumberelse {string} {then ...} {else ...}

This text suggest that the the test is on whether "string" as a whole  
is a number (taken as having digits 0123456789 only, I presume) of  
contains nondigits and thus isn't a number.

However, it seems the macro tests on the first character only.
Below follows a minimal example, the context version is:
ConTeXt  ver: 2010.02.18 14:48 MKIV  fmt: 2010.2.20  int: english/ 
english

% test result of \doifnumberelse
\def\test#1{#1 is \doifnumberelse{#1}{a number}{not a number}\crlf}
\starttext
\test{1}   % result: 1 is a number
\test{a}   % result: a is not a number
\test{1a}  % result: 1a is a number
\test{a1}  % result: a1 is not a number
\stoptext

Hans van der Meer





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Re: doifnumberelse

[Taco Hoekwater]

Hans van der Meer wrote:
> 
> This text suggest that the the test is on whether "string" as a whole is
> a number (taken as having digits 0123456789 only, I presume) of contains
> nondigits and thus isn't a number.


> However, it seems the macro tests on the first character only.

The wiki page has that remark added as a corrigendum to the article.

Best wishes,
Taco
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