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mallett
2024 May 03
2
Get a copy of a matrix only for TRUE entries of a matching size boolean matrix?
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...
2024 May 03
1
Get a copy of a matrix only for TRUE entries of a matching size boolean matrix?
...I was looking for, thanks. I'm replying to the whole
list so others can skip this question, to not waste time on it.
Bonne fin de journ?e de Montr?al (nous sommes le matin ici)
On Fri, May 3, 2024 at 10:30?AM Marc Girondot <marc_grt at yahoo.fr> wrote:
> Is it what you want ?
> mat_letters <- matrix(data=c('A', 'B', 'C', 'D'), ncol=2, byrow=TRUE)
> mat_bools <- matrix(data=c(FALSE, TRUE, TRUE, FALSE), ncol=2, byrow=TRUE)
>
> ifelse(mat_bools, mat_letters, "")
> ifelse(mat_bools, mat_letters, NA)
>
> > ifelse(mat_...