Thanks, A.K.
I managed to create diagonal matrices for character vectors. Since this new
behavior broke a package that I have written, I would like to make sure
that this new behavior was not introduced by mistakes. If this new behavior
is final, I will modify my code to fit it.
Mike
On Tue, Apr 9, 2013 at 10:14 PM, arun <smartpink...@yahoo.com> wrote:
> Hi,
> You could try this:
> v <- c("a", "b")
> mat1<-diag(length(v))
> diag(mat1)<- v
> mat1
> # [,1] [,2]
> #[1,] "a" "0"
> #[2,] "0" "b"
>
>
> v1<- letters[1:5]
> mat2<- diag(length(v1))
> diag(mat2)<- v1
> mat2
> # [,1] [,2] [,3] [,4] [,5]
> #[1,] "a" "0" "0" "0" "0"
> #[2,] "0" "b" "0" "0" "0"
> #[3,] "0" "0" "c" "0" "0"
> #[4,] "0" "0" "0" "d" "0"
> #[5,] "0" "0" "0" "0" "e"
> A.K.
>
>
>
>
> ----- Original Message -----
> From: Mike Cheung <mikewlche...@gmail.com>
> To: r-help <r-help@r-project.org>
> Cc:
> Sent: Tuesday, April 9, 2013 3:15 AM
> Subject: [R] Behaviors of diag() with character vector in R 3.0.0
>
> Dear all,
>
> According to CHANGES IN R 3.0.0:
> o diag() as used to generate a diagonal matrix has been re-written
> in C for speed and less memory usage. It now forces the result
> to be numeric in the case diag(x) since it is said to have 'zero
> off-diagonal entries'.
>
> diag(x) does not work for character vector in R 3.0.0 any more. For
> example,
> v <- c("a", "b")
>
> ## R 2.15.3
> diag(v)
> [,1] [,2]
> [1,] "a" "0"
> [2,] "0" "b"
>
> ## R 3.0.0
> diag(v)
> [,1] [,2]
> [1,] NA 0
> [2,] 0 NA
> Warning message:
> In diag(v) : NAs introduced by coercion
>
> Regarding the character matrix, it still works. For example,
> m <- matrix(c("a", "b", "c", "d"), nrow=2)
> diag(m)
> ## Both R 2.15.3 and 3.0.0
> [1] "a" "d"
>
> n <- matrix(0, ncol=2, nrow=2)
> diag(n) <- v
> n
> ## Both R 2.15.3 and 3.0.0
> [,1] [,2]
> [1,] "a" "0"
> [2,] "0" "b"
>
> I understand that the above behavior follows exactly what the manual says.
> It appears to me that the version in 2.15.3 is more general as it works for
> both numeric and character vectors and matrices, whereas the version in
> 3.0.0 works for character matrices but not character vectors.
>
> Would it be possible to retain the behaviors of diag() for character
> vectors? Thanks.
>
> Mike
> --
> ---------------------------------------------------------------------
> Mike W.L. Cheung Phone: (65) 6516-3702
> Department of Psychology Fax: (65) 6773-1843
> National University of Singapore
> http://courses.nus.edu.sg/course/psycwlm/internet/
> ---------------------------------------------------------------------
>
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>
--
---------------------------------------------------------------------
Mike W.L. Cheung Phone: (65) 6516-3702
Department of Psychology Fax: (65) 6773-1843
National University of Singapore
http://courses.nus.edu.sg/course/psycwlm/internet/
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