It's very easy to do in two steps: > testmat <- matrix(c(.2, .3, 1, -1, 3, .2, .4, 5, .5, -1), byrow=TRUE, nrow=2) > testmat [,1] [,2] [,3] [,4] [,5] [1,] 0.2 0.3 1 -1.0 3 [2,] 0.2 0.4 5 0.5 -1 > testmat[testmat >= 1] <- 1 > testmat[testmat < 0] <- 0 > testmat [,1] [,2] [,3] [,4] [,5] [1,] 0.2 0.3 1 0.0 1 [2,] 0.2 0.4 1 0.5 0
This is pretty basic. You might want to read one of the many excellent intro to R guides, especially the subsetting section. Sarah On Wed, May 25, 2011 at 2:51 PM, Jim Silverton <jim.silver...@gmail.com> wrote: > Hello everyone, > > > I have a 2 x 5 matrix: say > > 0.2 0.3 1 -1 3 > 0.2. 0.4 5 0.5 -1 > > I want to replace all the values greater than or equal to 1 with 1 and those > less than or equal to 0 with 0. So I should end up with a mtrix looking > like: > > 0.2 0.3 1 0 1 > 0.2. 0.4 1 0.5 0 > > Any ideas how to do this? > > -- > Thanks, > Jim. -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.