Message-ID: <da79af330803041622j67c9f819qeb2bf25994d356e5@mail.gmail.com>
Date: 2008-03-05T00:22:08Z
From: Henrique Dallazuanna
Subject: How to make a 2-dim array being "interpreted" as an array rather than as a matrix
In-Reply-To: <C83C5E3DEEE97E498B74729A33F6EAEC0562FBE0@DJFPOST01.djf.agrsci.dk>
I don't know if is the best way:
a3 <- array(a2, dim=c(nrow(a2), ncol(a2), 1))
foo(a3)
On 04/03/2008, S?ren H?jsgaard <Soren.Hojsgaard at agrsci.dk> wrote:
> Dear List
>
> A 2-dimensional array seems to be "interpreted" as a matrix whereas higher dimensional arrays are interpreted as arrays, e.g.
>
> > a1 <- array(1:8,c(2,2,2))
> > class(a1)
> [1] "array"
> > a2 <- array(1:4,c(2,2))
> > class(a2)
> [1] "matrix"
>
> If I write a generic function (apologies if this is the wrong word) on arrays as
>
> foo <- function(x) UseMethod("foo")
> foo.array <- function(x) sum(x)
>
> then this fails on a 2-dimensional array:
>
> > foo(a1)
> [1] 36
> > foo(a2)
> Error in UseMethod("foo") : no applicable method for "foo"
>
> Is there any way in which I can "force" a2 to being "interpreted" as having class "array" rather than "matrix" so that foo will work on a2???
>
> Thanks in advance
> S?ren
>
>
>
>
>
>
>
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>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O