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
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