> a <- matrix(1:8, 2, 4, byrow=TRUE)
> a
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
> a[c(1,2,1,2),]
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
[3,] 1 2 3 4
[4,] 5 6 7 8
>
On Wed, Apr 25, 2012 at 8:32 PM, Rebecca <rebecca0...@yahoo.cn> wrote:
> Hi,
> If I have a matrix like
> 1 2 3 4
> 5 6 7 8,
> how can I repeat two rows as whole, to be like
> 1 2 3 4
> 5 6 7 8
> 1 2 3 4
> 5 6 7 8?
>
> Since I have more two rows in a matrix and I need to repeat many times, I
> wonder whether there is a convenient command to do so.
>
> Thanks!
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
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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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
>
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