non-consing count
What is the concern if it works? you can also do sum(x==0) Is performance a concern? How often are you going to do it and what other parts of your script also take longer? Why are you concerned about allocating/discarding two vectors?
On Fri, Jan 4, 2013 at 10:30 AM, Sam Steingold <sds at gnu.org> wrote:
Hi, to count vector elements with some property, the standard idiom seems to be length(which): --8<---------------cut here---------------start------------->8--- x <- c(1,1,0,0,0) count.0 <- length(which(x == 0)) --8<---------------cut here---------------end--------------->8--- however, this approach allocates and discards 2 vectors: a logical vector of length=length(x) and an integer vector in which. is there a cheaper alternative? Thanks! -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://iris.org.il http://honestreporting.com http://jihadwatch.org http://pmw.org.il http://www.PetitionOnline.com/tap12009/ War doesn't determine who's right, just who's left.
______________________________________________ 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.
Jim Holtman Data Munger Guru What is the problem that you are trying to solve? Tell me what you want to do, not how you want to do it.