Antje wrote: > 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
testmatrix[!apply(is.na(testmatrix), 1, all), !apply(is.na(testmatrix), 2, all)] [,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. > > -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ 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.