Also note the behavior is the same for a non-list vector:
> c(b=1)[c('a','b')]
b
NA1
but differs for a data frame:
> data.frame(b=1)[c('a','b')]
Error in `[.data.frame`(data.frame(b = 1), c("a", "b")) :
undefined columns selected
On Fri, Nov 28, 2008 at 2:03 PM, Vadim Ogranovich
<[
Dear R-devel,
When a character vector is used to subscript a list and when some of the
subscripts are not present in the list names R returns NULL for those
subscripts and generate NA names for each of them:
> list(b=1)[c('a','b')]
$ <<-- generated name
NULL
$b
[1] 1
Wouldn't it be more int
