[Rd] trace trap (PR#3324)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Jun 23 18:00:28 MEST 2003
On Mon, 23 Jun 2003 p.e.brown at lancaster.ac.uk wrote:
> Hi. I wanted to add two new columns to a data frame, and ended up
> crashing R
>
> > temp <- data.frame(a=1:3, b=4:6)
> > temp[[c("d","e")]] <- NA
>
> Process R trace trap at Mon Jun 23 16:32:36 2003
>
> I know the above code isn't very elegent, but it shouldn't crash R.
It's erroneous code, and the current development version of R correctly
reports so.
> I managed to add the new columns doing
>
> > temp[,c("d","e")] <- NA
or temp[c("d","e")] <- NA.
Are you sure you know the difference between [] and [[]]?
--
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
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