[R] sampling rows from a list

[Bcampbell99]

Hi:

I'm sure this seems like a rudimentary question, but I am not well versed
with R syntax for lists.  I have a ragged array from which I've removed
records (entire rows) with missing data.  The functions I used to remove the
missing cases resulted in the generation of an R list class object, that
looks something like this;

mydata
[[1]]
     [,1] [,2] [,3]
[1,]    1    2    3
[2,]    4    5    6
[3,]    7    8    9

[[2]]
     [,1] [,2] [,3]
[1,]   10   11   12
[2,]   13   14   15

[[3]]
     [,1] [,2] [,3]
[1,]   16   17   18
[2,]   19   20   21
[3,]   22   23   24
[4,]   25   26   27
[5,]   28   29   30

Part1
What I would like to do is draw an equal number of random row samples
from[[1]],[[2]] and [[3]] (to preserve the structure of [,1][,2],[,3].

Part2
Then I would like to cocerce the list object into something like an array. 

Help scripting out part 1 or 2 would be much appreciated.

Brian Campbell




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