> According to its man page substring() "expands (its) arguments
> cyclically to the length of the longest _provided_ none are of
> zero length".
>
> So, as expected, I get an error here:
>
> > substring("abcd", first=2L, last=integer(0))
> Error in substring("abcd", first = 2L, last = integer(0)) :
> invalid substring argument(s)
>
> But I don't get one here:
>
> > substring(character(0), first=1:2, last=3L)
> character(0)
>
> which is unexpected.
If you want a set of string functions that strive to be simple and
consistent you might want to look at the stringr package. And since
it's a new package, I'm very keen to remove any inconsistencies.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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