"Charles C. Berry" <[EMAIL PROTECTED]> a écrit :
On Fri, 24 Oct 2008, Christophe Genolini wrote:
Hi the list,
unlist respect the all the atomic type except orderd (it change of
ordered into factor) :
### integer
class(unlist(list(1:5,1:3)))
#[1] "integer"
### numeric
class(unlist(list(1.2,3.5)))
#[1] "numeric"
### character
class(unlist(list("e","e")))
#[1] "character"
### factor
class(unlist(list(factor("e"),factor("e"))))
#[1] "factor"
### ordered
class(unlist(list(ordered("e"),ordered("e"))))
#[1] "factor"
Consider
unlist(list(ordered(1:2),ordered(letters[1:4])))
Since one cannot deduce what ordering should apply, the best that can
be done is to demote all arguments to factors.
This is the general case. Only in the special case in which all list
elements are of class 'ordered' and the levels attributes are the
same would this be sensible.
This "only special" case is quite common since the use of lapply on
ordered gives such a list
Christophe
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