On Oct 3, 2009, at 7:51 PM, Andrew Yee wrote:
Take the following code:
foo <- list()
foo[[1]] <- list(a=1, b=2)
foo[[2]] <- list(a=11, b=22)
foo[[3]] <- list(a=111, b=222)
Instead, perhaps:
> do.call(rbind, lapply(foo, unlist))
a b
[1,] 1 2
[2,] 11 22
[3,] 111 222
> do.call(rbind, lapply(foo, unlist))[,"a"]
[1] 1 11 111
result <- do.call(rbind, foo)
result[,'a']
class(result) # also matrix
In this case, result[,'a'] shows a list. Is there a more elegant way
such
that result is a "regular" matrix of vectors? I imagine there are
manual
ways of going about this, but I was wondering if there was an
obvious step
that I was missing.
Your example shows that a matrix can be constructed around a list,
although I agree with you that this seems a bit unusual.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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