On Sat, Feb 18, 2012 at 11:51:39AM -0800, Pete Brecknock wrote: > > maris478 wrote > > > > Good afternoon, > > I've encountered a little bit of a problem, would appreciate any help > > here. > > > > I made a small vector consisting of ones and zeros. > > Something like this x <- c(0,1,0,1,0,0,1,0), and all I need is to count > > how many times "0" becomes "1". > > Tried various, of what I thought, methods with built in functions. Didn't > > get any further.
Hi. Do you mean the number of occurences of subsequence "0,1" ? Try x <- c(1,0,1,0,1,0,0,1,0) sum(diff(x) == 1) [1] 3 The first 1 is not counted, since it is not preceded by 0. Hope this helps. Petr Savicky. ______________________________________________ [email protected] 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.
