What does `show up in' mean? There are lots of subtle variations.
For an exact match try sum(instring == instringector).
For inclusion try length(grep(instring, instringector), but you would
need to escape e.g. .[]{}()*\^$ in instring. You could anchor the match
to the beginning .... (grep on old Windows versions of S-PLUS wasn't a
grep at all.)
On Thu, 28 Aug 2003, Leeds, Mark wrote:
> i have a character string and i am trying
> to find out how many times that
> character string shows
> up in another vector of character strings.
>
> unfortunately, match doesn't
> do what i want because if i do
>
> stringindex_pmatch(instring,instringector)
That's some of the hardest-to-read code I've seen for a while but it
seems to be using pmatch(), not match(). (And there is also charmatch.)
The use of _ for assignment is deprecated (in S-PLUS 6.1, for example).
Did you have trouble reading it too? (It took me several looks to spot
the discrepancy.)
> stringindex only returns the first occurrence.
>
> is there some other function that does
> what i need ? i can't find one.
> i guess i could write
> something but my guess is
> that it exists already.
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
|