Or faster (both computational speed and amount of code): colSums(is.na(rbind(c1, c2, c3)))
On Thu, Oct 17, 2013 at 4:34 AM, Carl Witthoft <c...@witthoft.com> wrote: > mattbju2013 wrote > > Hi guys this is my first post, i need help summing the number of NA's in > a > > few vectors > > > > for example.. > > > > c1<-c(1,2,NA,3,4) > > c2<-c(NA,1,2,3,4) > > c3<-c(NA,1,2,3,4) > > > > how would i get a result that only sums the number of NA's in the vector? > > the.result.i.want<-c(2,0,1,0,0) > > See ?is.na . > Now, if I can interpret your question correctly, you're actually looking > for > the number of NA per *position* in the vectors, so let's make them into a > matrix first. > > cmat<-rbind(c1,c2,c3) > then use apply over columns > apply(cmat,2,function(k)sum(is.na(k))) > > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/How-would-i-sum-the-number-of-NA-s-in-multiple-vectors-tp4678411p4678432.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 http://joshuawiley.com/ Senior Analyst - Elkhart Group Ltd. http://elkhartgroup.com [[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.
