R help - Oct 2011 - replicate data.frame n times

Hi,


is there a way to replicate a data.frame like you can replicate the entries of a
vector (with the repeat-function)?

I want to do this:

x <- data.frame(x, x)
(where x is a data.frame).


but n times.



And it should be as cpu / memory efficient as possible, since n is pretty big in
my case.



thanks for any suggestions!

Replicate the row indices?

x[rep(seq_len(nrow(x)), k), ]

-- Bert

On Tue, Oct 11, 2011 at 12:55 PM, Martin Batholdy
<batholdy@googlemail.com>wrote:
> Hi,
>
>
> is there a way to replicate a data.frame like you can replicate the entries
> of a vector (with the repeat-function)?
>
> I want to do this:
>
> x <- data.frame(x, x)
> (where x is a data.frame).
>
>
> but n times.
>
>
>
> And it should be as cpu / memory efficient as possible, since n is pretty
> big in my case.
>
>
>
> thanks for any suggestions!
> ______________________________________________
> 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.
>


-- 
"Men by nature long to get on to the ultimate truths, and will often be
impatient with elementary studies or fight shy of them. If it were possible
to reach the ultimate truths without the elementary studies usually prefixed
to them, these would not be preparatory studies but superfluous
diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics
467-7374
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

	[[alternative HTML version deleted]]

On Oct 11, 2011, at 4:22 PM, Bert Gunter wrote:
> Replicate the row indices?
>
> x[rep(seq_len(nrow(x)), k), ]
Or the column indices.

x[ , rep(seq_len(length(x)), k) ]

--  
David,
>
> -- Bert
>
> On Tue, Oct 11, 2011 at 12:55 PM, Martin Batholdy
> <batholdy at googlemail.com>wrote:
>
>> Hi,
>>
>>
>> is there a way to replicate a data.frame like you can replicate the  
>> entries
>> of a vector (with the repeat-function)?
>>
>> I want to do this:
>>
>> x <- data.frame(x, x)
>> (where x is a data.frame).
>>
>>
>> but n times.
>>
>>
>>
>> And it should be as cpu / memory efficient as possible, since n is  
>> pretty
>> big in my case.
>>
>>
>>
>> thanks for any suggestions!
>> ______________________________________________
>> R-help at 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.
>>
>
>
>
> -- 
> "Men by nature long to get on to the ultimate truths, and will often  
> be
> impatient with elementary studies or fight shy of them. If it were  
> possible
> to reach the ultimate truths without the elementary studies usually  
> prefixed
> to them, these would not be preparatory studies but superfluous  
> diversions."
>
> -- Maimonides (1135-1204)
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
> 467-7374
>
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
David Winsemius, MD
West Hartford, CT