Hello, sorry for the newbie question but I can't find out where I'm wrong.
A <- matrix(1:9,ncol=3) x <- c(0,1,0) M <- matrix(ncol=3,nrow=3) for(i in 1:3) { M[,i] <- ifelse(x[i] == 0, A[,i], 0) } expected:
M
[,1] [,2] [,3] [1,] 1 0 7 [2,] 2 0 8 [3,] 3 0 9 but the result is:
M
[,1] [,2] [,3] [1,] 1 0 7 [2,] 1 0 7 [3,] 1 0 7 If I do it "manually":
M[,1] <- A[,1] M[,2] <- 0 M[,3] <- A[,3]
M is as expected, where is my misconception? Thanks for any hint and best regards, Uwe ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.