Counting value changes
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".
Since x consists solely of 0's and 1's this is same as sum(diff(x)==1) # 3 in your example Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Pete Brecknock Sent: Saturday, February 18, 2012 11:52 AM To: r-help at r-project.org Subject: Re: [R] Counting value changes 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. Thank you very much.
How about ... x <- c(0,1,0,1,0,0,0,0) sum(rle(x)$values) HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Counting-value-changes- tp4400267p4400348.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at 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.