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2005 May 17
2
how to use list index to get vector
I have a simple question, but I couldn't find the answer in R manuals.
Assume I have a list:
> foo <- list()
> foo[[1]] <- c(1, 2, 3)
> foo[[2]] <- c(11,22,33)
> foo[[3]] <- c(111,222,333)
> foo
[[1]]
[1] 1 2 3
[[2]]
[1] 11 22 33
[[3]]
[1] 111 222 333
How to use list index to get a vector of, say, the first elements of
list elements?
That is, how to get a vector