On 2/12/2009, at 3:08 PM, Sharpie wrote:
Amir Liu wrote:
In l[3] <- matrix(1:4, 2, 2) :
number of items to replace is not a multiple of replacement length
When inserting single entries into a list list, you should use the
'[[ ]]'
notation. Use '[ ]' when you want to extract multiple entries or copy
multiple entries from one list to another:
l <- list()
l[[ 1 ]] <- 5
l[[ 2 ]] <- 'cd'
l[[ 3 ]] <- matrix( 1:4, 2, 2 )
l
[[1]]
[1] 5
[[2]]
[1] "cd"
[[3]]
[,1] [,2]
[1,] 1 3
[2,] 2 4
Hope this helps!
The key issue is that l[3] is a ***list*** of length 1 whose single
entry
is the object that was the third entry of ``l''. But l[[3]] is
***the object***
that was the third entry of ``l''. It's like the difference a box
containing
the third chocolate from a box of chocolates and that third chocolate.
cheers,
Rolf Turner
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