Hi,
I would love an easy way to extract elements from a list.
For example, if I want the first element from each of 10 arrays stored
in a list,
Lst[[1:10]][1,1] seems like a logical approach, but gives this error:
Error: recursive indexing failed at level 3
The following workaround is
Try
sapply( Lst, function(m) m[1,1] )
Also note that to subset a list, you just need Lst[ 1:10 ] and not
Lst[[ 1:10 ]] (note the double square brackets).
Regards, Adai
Forest Floor wrote:
Hi,
I would love an easy way to extract elements from a list.
For example, if I want the first
Use lapply or sapply:
L - list(a = 1:4, b = 11:15)
lapply(L, [[, 1)
$a
[1] 1
$b
[1] 11
sapply(L, [[, 1)
a b
1 11
Also please see last line on every r-help message regarding providing
reproducible code. Lst was not defined in your post.
On 7/14/07, Forest Floor [EMAIL PROTECTED] wrote:
The golden rule is that [[ ]] only returns one element:
sapply(Lst, [, 1, 1)
is probably what you want.
On Sat, 14 Jul 2007, 'Forest Floor' aka 'rhago' aka 'Jeff' aka 'R User
confused about his identity' wrote:
Hi,
I would love an easy way to extract elements from a list.
For example, if
