In two steps: result <- matrix(NA_character_, nrow=nrow(mat_letters), ncol =ncol(mat_letters)) result[mat_bools] <- mat_letters[mat_bools]
On 2024-05-03 8:47 a.m., DynV Montrealer wrote:
Is there a way to get a copy of a matrix only for TRUE entries of a matching size boolean matrix? For *example*:mat_letters <- matrix(data=c('A', 'B', 'C', 'D'), ncol=2, byrow=TRUE) mat_letters[,1] [,2] [1,] "A" "B" [2,] "C" "D"mat_bools <- matrix(data=c(FALSE, TRUE, TRUE, FALSE), ncol=2, byrow=TRUE) mat_bools[,1] [,2] [1,] FALSE TRUE [2,] TRUE FALSE *Reminder:* The following is only an example ; the solution might look very different. some_command(mat_letters, mat_bools, false=empty) [,1] [,2] [1,] "" "B" [2,] "C" "" some_command(mat_letters, mat_bools, false=na) [,1] [,2] [1,] NA "B" [2,] "C" NA Thank you kindly [[alternative HTML version deleted]] ______________________________________________ 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.
______________________________________________ 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.
