Why not use 'head' > head(1:10, -1) [1] 1 2 3 4 5 6 7 8 9 > head(1, -1) numeric(0) > head(integer(0), -1) integer(0)
On Mon, Apr 18, 2011 at 8:13 AM, Kenn Konstabel <lebats...@gmail.com> wrote: > On Mon, Apr 18, 2011 at 4:14 AM, helin_susam <helin.su...@gmail.com> wrote: >> if you have a vector like as follows; >> >> r=c(1,2,3,4,5) >> >> then use >> >> r2=r[1:length(r)-1] > > Umm ... this works and gives the intended answer but does so in an ugly way -- > > 1:length(r)-1 is equivalent to (1:length(r))-1 or 0:(length(r)-1) -- > in other words, you get a sequence from 0 to 4. The result of r[0] is, > curiously, integer(0) (but if you think about it, it might just as > well be an error), so you get the intended result but what you > probably actually meant is > > r2=r[1:(length(r)-1)] > > # or > > r2=r[1:seq_len(length(r)-1)] > > > KK > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
