a <- matrix(1:8, 2, 4, byrow=TRUE)
b<-t(a)
r<-rep(b,5) # can insert anything for 5
matrix(r,ncol=dim(a)[2],byrow=T)
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
[3,] 1 2 3 4
[4,] 5 6 7 8
[5,] 1 2 3 4
[6,] 5 6 7 8
[7,] 1 2 3 4
[8,] 5 6 7 8
[9,] 1 2 3 4
[10,] 5 6 7 8
Am 26.04.2012 um 13:38 schrieb Petr PIKAL:
> Hi
>
> what about
>
> rbind(a,a)
> [,1] [,2] [,3] [,4]
> [1,] 1 2 3 4
> [2,] 5 6 7 8
> [3,] 1 2 3 4
> [4,] 5 6 7 8
>
> Regards
> Petr
>
>
>>
>>> 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.
>>>
>>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> 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.
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
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