[R] Putting the same array into a matrix

[Charles C. Berry]

On Thu, 14 Oct 2010, Desmond Lim wrote:

> Hi,
>
> I have an array and I want to put in into a matrix x number of times. Currently I doing this
>
> matrix <- cbind(array, array, array).
>
> Is there a more elegant way of doing this?

Fortunately!

If 'array' really is a matrix (bad choice of names here, Bub!), then

a.matrix <- matrix( rep( array, 3 ), nc = ncol( array )* 3 )

But this will work too:

a.matrix <- do.call( cbind, rep( list( array ), 3) )

even if 'array' is a data.frame

HTH,

Chuck


>
> I've tried
>
> matrix <- cbind(rep(array, times=x)) and matrix <- rep(cbind(array), times = 5)
>
> but it didn't work.
>
> Thanks.
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901