> 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 <rebecca0420@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!
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>
>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
>

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