[R] replicate matrix blocks different numbers of times into new matrix

From: Ralph S. <ruffel1_at_hotmail.com>
Date: Sat, 19 Jul 2008 18:30:50 +0000

Hi,

I am trying to replicate blocks of a matrix (defined by factors) into another matrix, but an unequal, consecutive number of times for each factor.

I need to find an elegant and fast way to do this, so loops will not work.

An example of what I am trying to do is the following:

# the data - first column entries are both data and the two factors x<-matrix(c(1,2,3,4),2,2)
> x

     [,1] [,2]
[1,] 1 3
[2,] 2 4

# the number of repetitions of the first and second factor n<-c(1,3)

This is what I want as output:

     [,1] [,2]
[1,] 1 3
[2,] 2 4
[3,] 2 4
[4,] 2 4

Any ideas how to get there? I have tried using tapply with combination of rep, but this does not work (I need 1 and then 3 replications).

Any help would be great!

-Ralph



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