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matrix Manipulation...
2 messages · Jim Silverton, Sarah Goslee
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.silverton at 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