Hi, If an "ordered run" means the difference is between the ith and ith + 1 position is 1, then:
out <- rle(diff(x)) ?diff gives you the differences (i + 1) - (i), and then run length encoding encodes how long a run of the same number is. In this case, there first run is length 7. rle() outputs a list. If you only want to consider runs that change by 1, then use the "values" element of the list to select only those out$values == 1 if it is not at the beginning of the vector, cumsum(out$lengths) can help to find the right indices to extract your run. Hope this helps, Josh On Wed, Jul 6, 2011 at 4:32 PM, B77S <bps0...@auburn.edu> wrote: > Hi, > > How can I discern which elements in x (see below) are in 'order', but more > specifically.. only the 1st 'ordered run'? > I would like for it to return elements 1:8... there may be ordered values > after 1:8, but those are not of interest. > > x <- c(1, 2, 3, 4, 5, 6, 7, 8, 20, 21, 22, 45) > > > Thanks for any suggestions. > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/identifying-a-run-in-a-vector-tp3650295p3650295.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles https://joshuawiley.com/ ______________________________________________ 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.
