Hi Nevil, Try
apply(A, 2, function(x) x == B) HTH, Jorge.- On Fri, May 2, 2014 at 6:46 PM, nevil amos <nevil.a...@gmail.com> wrote: > I wish to return " True" in a matrix for only the first match of a value > per row where the value equals that in a vector with the same number of > values as rosw in the matrix > > eg: > A<-matrix(c(2,3,2,1,1,2,NA,NA,NA,5,1,0,5,5,5),5,3) > B<-c(2,1,NA,1,5) > desired result: > > [,1] [,2] [,3] > [1,] TRUE FALSE FALSE > [2,] FALSE NA FALSE > [3,] NA NA NA > [4,] TRUE NA FALSE > [5,] FALSE TRUE FALSE > > however A==B returns: > [,1] [,2] [,3] > [1,] TRUE TRUE FALSE > [2,] FALSE NA FALSE > [3,] NA NA NA > [4,] TRUE NA FALSE > [5,] FALSE TRUE TRUE > and > apply(A,1,function(x) match (B,x)) > returns > [,1] [,2] [,3] [,4] [,5] > [1,] 1 NA 1 NA NA > [2,] 3 NA NA 1 1 > [3,] NA 2 2 2 NA > [4,] 3 NA NA 1 1 > [5,] NA NA 3 3 2 > > thanks > > [[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. > [[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.
