Sebastian Lerch wrote: > > Hi everyone, > > my question might be very trivial, but I could not come up with an > answer... > > I want to find out how often a matrix contains a certain vector as row: > > x1<-c(1,2,3) > x2<-c(1,5,6) > x3<-c(7,8,9) > A<-matrix(c(rep(x1,5),rep(x2,5),rep(x3,5),rep(x1,5)),nrow=20,ncol=3,byrow=T) > > How can I find out, how many times x1 is a row of A? > >
v <- apply(A,1, FUN = function(x)identical(x,x1)) v sum(v) v <- apply(A,1, FUN = function(x)all(zapsmall(x-x1)==0)) v sum(v) Berend -- View this message in context: http://r.789695.n4.nabble.com/Finding-all-rows-of-a-matrix-equal-to-vector-tp3671606p3671672.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.
