Hello Wendy,
The simplest solution that comes to mind is to just use cbind.
For instance:
> x <- matrix(1:4, nrow=2)
> x
[,1] [,2]
[1,] 1 3
[2,] 2 4
> cbind(x,x,x,c(2,5)) # repeat x here as many times as needed
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 1 3 1 3 1 3 2
[2,] 2 4 2 4 2 4 5
I hope that helps. Admittedly, this is not the best solution if you need to
replicate a matrix many times.
Best,
Joshua
On Sat, Feb 20, 2010 at 6:58 PM, wendy <wendy.q...@utoronto.ca> wrote:
>
> Hi all,
>
> I have a matrix, for example
> [,1] [,2]
> [1,] 1 3
> [2,] 4 6
>
> I want to replicate the matrix twice and add an extra column at the end,
> which is
> [,1] [,2] [,3] [,4] [,5] [,6] [,7]
> [1,] 1 3 1 3 1 3 2
> [2,] 4 6 4 6 4 6 5
>
> I found 'rep' only works for vector. Does anyone know how to replicate a
> matrix, and append the matrix?
>
> Thank you in advance,
> Wendy
>
>
> --
> View this message in context:
> http://n4.nabble.com/replicate-matrix-tp1563337p1563337.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/
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