"Scott Norton" <[EMAIL PROTECTED]> wrote:
I have a "list" of character vectors. I'm trying to see if
there is a way (in a single line, without a loop) to pull out
the first element of all the vectors contained in the list.
You have a list.
You want to do something to each element.
See ?lapply
> u <- c("Fee","fie","foe","fum")
> v <- c("Ping","pong","diplomacy")
> w <- c("Hi","fi")
> x <- list(a=u, b=v, c=w)
> lapply(x, function (cv) cv[1])
$a
[1] "Fee"
$b
[1] "Ping"
$c
[1] "Hi"
If you want the result as a character vector, see ?sapply
> sapply(x, function (cv) cv[1])
a b c
"Fee" "Ping" "Hi"
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