R help - Feb 2011 - add repeated rows in data frame (without a loop)

Hi All,

I have a data frame "pop":

 >    id  xloc  yloc  size
 > 1  1	  10	12    95
 > 2  2    11	10    81

And I want to add the vector "rec" to the data frame "n"
times (without
using a loop):

 > rec=c(3, 5, 5, 10)
 > n=2

The result I want:

 >    id  xloc  yloc size
 > 1  1	  10	12   95
 > 2  2    11	10   81
 > 3  3	  5	5    10
 > 4  3    5     5    10		

I know I can use pop=rbind(pop, rec) to add the vector "rec" once.
What
about adding the same vector "n" times without a for loop?  Any hints?

THANKS!

Nico

On 2011-02-22 14:48, Nicolas Gutierrez wrote:
> Hi All,
>
> I have a data frame "pop":
>
>   >     id  xloc  yloc  size
>   >  1  1	  10	12    95
>   >  2  2    11	10    81
>
> And I want to add the vector "rec" to the data frame
"n" times (without
> using a loop):
>
>   >  rec=c(3, 5, 5, 10)
>   >  n=2
>
> The result I want:
>
>   >     id  xloc  yloc size
>   >  1  1	  10	12   95
>   >  2  2    11	10   81
>   >  3  3	  5	5    10
>   >  4  3    5     5    10		
>
> I know I can use pop=rbind(pop, rec) to add the vector "rec"
once. What
> about adding the same vector "n" times without a for loop?  Any
hints?
Try this:

  popm <- as.matrix(pop)
  recm <- matrix(rep(rec, n), nr=n, byrow=TRUE)
  newpop <- data.frame(rbind(popm, recm))

Peter Ehlers
>
> THANKS!
>
> Nico
>
> ______________________________________________
> 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.

That worked.. thanks Peter

On 2/22/2011 5:40 PM, Peter Ehlers wrote:
>   popm <- as.matrix(pop)
>   recm <- matrix(rep(rec, n), nr=n, byrow=TRUE)
>   newpop <- data.frame(rbind(popm, recm))