X <- matrix(c( 1, 2, 3, 4, "x", "x", 2, 2, 2, 2, 2, 2, 2, "x", 2), ncol=5, byrow=TRUE)
X.new <- matrix(as.numeric(X), ncol=ncol(X)) or X.new <- apply(X, 2, function(x){replace(x, x == "x", NA)}) Stefan Semmeling wrote: > dear list, > > i have a matrix with missing values like > > 1 2 3 4 x > x 2 2 2 2 > 2 2 2 x 2 > > the x stands for the missing value. > i have to substitute it to NA > > substitute or replace didn´t work out, as they are for vectors only > > however matrix[,i] also didn´t work. > > can anybody tell me, who i can change these values easily? > > thanks stefan > > [[alternative HTML version deleted]] > > > > ------------------------------------------------------------------------ > > ______________________________________________ > 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 -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (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