R help - Nov 2002 - repeating a dataframe n times in the direction of the rows

Question:
    How can a repeat a dataframe n times 
    in the direction of the rows?
    (Or: How I can rbind a dataframe n times ?)


Example Data:
    x <- data.frame( alpha=letters[1:3], num=1:3 )
    n <- 4


Complicated solution: To rbind a dataframe n times I can program a loop:

    xr <- x
    for( i in 2:n ) xr <- rbind( xr, n )


Observation: To cbind a dataframe n times I can use rep:

    xc <- data.frame( rep( x, n ) )


Is there a similar possibility to repeat in the direction of the rows?


Wolfram
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Wolfram Fischer <wolfram at fischer-zim.ch> writes:
> Question:
>     How can a repeat a dataframe n times 
>     in the direction of the rows?
>     (Or: How I can rbind a dataframe n times ?)
> 
> 
> Example Data:
>     x <- data.frame( alpha=letters[1:3], num=1:3 )
>     n <- 4
> 
> 
> Complicated solution: To rbind a dataframe n times I can program a loop:
> 
>     xr <- x
>     for( i in 2:n ) xr <- rbind( xr, n )
> 
> 
> Observation: To cbind a dataframe n times I can use rep:
> 
>     xc <- data.frame( rep( x, n ) )
> 
> 
> Is there a similar possibility to repeat in the direction of the rows?
How about

x[rep(1:nrow(x),n),]

?
-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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You can use 't' to transpose your data.frame then you do what you said
by 'cbind' and at last you transpose again.

Best!
A.S.
----------------------------------
Sincerely yours.

Dr. Alessandro Semeria                             Tel. +39 544 536811
Models and Simulation Lab of                                 Fax. +39 544
538663
The Environment Research Center - Montecatini (Edison Group),
E-mail: asemeria at cramont.it
Via Ciro Menotti 48,
48023 Marina di Ravenna (RA), Italy


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