try this: > x [1] 1 2 3 6 7 10 11 12 13 > # find breaks > breaks <- c(FALSE, diff(x) != 1) > # now create matrix with groupings (just for visual) > z <- data.frame(x, cumsum(breaks)) > # create list with first element of each seq and the length > t(sapply(split(z, z[,2]), function(b) c(b[1,1], nrow(b)))) [,1] [,2] 0 1 3 1 6 2 2 10 4
On Wed, Jun 10, 2009 at 1:28 PM, Eric Vander Wal <eric.vander...@usask.ca>wrote: > Thanks in advance. > I have a vector of numbers which contain sections that are sequences which > increase by a value of 1 followed by a gap in the data and then another > sequence occurs, etc: > > x<-c(1:3, 6: 7, 10:13) > > From the vector I need to extract 2 items of information A) the first > number in the sequence (e.g., 1, 6, 10) and B) how many observations were in > each sequence section (e.g., 3, 2, 4). > > v1 v2 > 1 3 > 6 2 > 10 4 > > It seems simple, but my R skills are still in their infancy so I very much > appreciate the help. > Eric > > -- > Eric Vander Wal > Ph.D. Candidate > University of Saskatchewan, Department of Biology, > 112 Science Place, Saskatoon, SK., S7N 5E2 > > "Pluralitas non est ponenda sine neccesitate" > > ______________________________________________ > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ 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.
