Hello, I guess, it's a rather simple thing but I cannot find a short way to reduce a matrix, removing all rows and columns having just NA elements.
testmatrix <- matrix(nrow=6, ncol=4) testmatrix[2:5,2:3] <- seq(2) > testmatrix [,1] [,2] [,3] [,4] [1,] NA NA NA NA [2,] NA 1 1 NA [3,] NA 2 2 NA [4,] NA 1 1 NA [5,] NA 2 2 NA [6,] NA NA NA NA the new matrix should look like this (by the way, I don't "know" which rows and columns are the one to be deleted... > testmatrix [,1] [,2] [1,] 1 1 [2,] 2 2 [3,] 1 1 [4,] 2 2 Ciao, Antje ______________________________________________ R-help@stat.math.ethz.ch 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.