Re: [R] Dimension of a vector

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Tue, 4 Dec 2007 19:42:08 -0500

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
> Phone +64 7 838 4773 wk Home +64 7 825 0441 Mobile 021 1395 862
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed 05 Dec 2007 - 00:50:06 GMT

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