Hi Wendy, try this: Z <- matrix(runif(1000)>0.5,10,100) rowSums(Z)
HTH, Denes > Hi all, > > I have a huge matrix of TRUE/FALSE table like following, and I want to > count > the number of TRUEs in each row. Instead of looping through each row and > do > length(Z[Z==TRUE]), I am wondering if there is an easier way of doing > this. > > [,1] [,2] [,3] > [1,]TRUE FALSE FALSE > [2,]FALSE TRUE TRUE > > Thank you in advance. > Wendy > > -- > View this message in context: > http://r.789695.n4.nabble.com/count-number-of-TRUEs-in-each-row-tp3440486p3440486.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. > ______________________________________________ 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.
