Richard A. O'Keefe [EMAIL PROTECTED] writes:
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
Or
do.call(cbind,x)[1,]
which of course makes a whole new copy of x and
gives you a nasty warning as well, but does not
use a conceptual `for` loop. Which I think was the
original question, to which AFAIK the answer is no, there is no
easy subscripting construct such as x[[1:3]][1] that will do
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
How about:
lst - list(c(a, b, c), c(d, e, f))
sapply(lst, function (x) x[1])
[1] a d
Cheers,
Simon.
Simon Blomberg, PhD
Depression Anxiety Consumer Research Unit
Centre for Mental Health Research
Australian National University
http://www.anu.edu.au/cmhr/
[EMAIL PROTECTED] +61 (2) 6125 3379
