On 26-06-2013, at 10:03, Sachinthaka Abeywardana <sachin.abeyward...@gmail.com> wrote:
> Hi all, > > What would be an efficient way to match rows of a matrix to a vector? > > ex: > > m<-matrix(1:9, nrow=3) > > m [,1] [,2] [,3] > [1,] 1 4 7 > [2,] 2 5 8 > [3,] 3 6 9 > > ################################# > which(m==c(2,5,8)) # I want this to return 2 > ###################### Something like this: matroweqv <- function(m,v) which(t(m)==v, arr.ind=TRUE)[,2][1] matroweqv(m,c(2,5,8)) # [1] 2 Berend ______________________________________________ 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.
