[R] ragged array with append
Alexy Khrabrov
deliverable at gmail.com
Sat Nov 24 11:59:37 CET 2007
I wonder what's the right way in R to do the following -- placing
objects of the same kind together in subarrays of varying length.
Here's what I mean:
> word <- c("a","b","c","d","e","f","g","h","i","j")
> kind <- c(1,1,1,2,3,4,5,5,7,7)
> d <- data.frame(word,kind)
> d
word kind
1 a 1
2 b 1
3 c 1
4 d 2
5 e 3
6 f 4
7 g 5
8 h 5
9 i 7
10 j 7
Now from this data frame, I want to assemble words of the same kind
into lists. The result should look like (not R syntax):
1 => [a,b,c]
2 => [d]
3 => [e]
4 => [f]
5 => [g,h]
7 => [i,j]
What is the most appropriate data structure in R for this result and
growing these sublists most effectively with append?
Cheers,
Alexy
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