[R] Character position command

Prof Brian Ripley ripley at stats.ox.ac.uk
Sun Aug 26 07:38:31 CEST 2007

On Sat, 25 Aug 2007, Mitchell Hoffman wrote:

> This is a very simple question, so I apologize I couldn't find it online:
> I want to shorten the string 'apples.pears' to 'apples'.
> string='apples.pears'
> string1=substr(string,0,x)
> For x above, I would like to have a command like charAt(string,"."), i.e.
> the position of the period in the word, but I can't seem to find a charAt
> command in R.

See ?regexpr

But a simpler solution is sub("\\..*", "", string).

Brian D. Ripley,                  ripley at 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

More information about the R-help mailing list