# [R] Dimension of a vector

Gabor Grothendieck ggrothendieck at gmail.com
Wed Dec 5 01:42:08 CET 2007

```In R, vectors don't have dimensions, arrays do.

> x <- c(1, 4, 5)
> class(x)
[1] "numeric"
> y <- array(x)
> class(y)
[1] "array"
> dim(x)
NULL
> dim(y)
[1] 3

On Dec 4, 2007 7:35 PM,  <maj at stats.waikato.ac.nz> wrote:
> Consider the following:
> > A <- 1:10
> > A
>  [1]  1  2  3  4  5  6  7  8  9 10
> > dim(A)
> NULL
> > dim(A) <- c(2,5)
> > A
>     [,1] [,2] [,3] [,4] [,5]
> [1,]    1    3    5    7    9
> [2,]    2    4    6    8   10
> > dim(A)
> [1] 2 5
> > dim(A) <- 10
> > A
>  [1]  1  2  3  4  5  6  7  8  9 10
> > dim(A)
> [1] 10
>
> Would it not make sense to have dim(A) = length(A) for all vectors?
>
> Murray
> --
> Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html
> Department of Statistics, University of Waikato, Hamilton, New Zealand
> Email: maj at waikato.ac.nz                                Fax 7 838 4155
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>
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