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.
HTH,
Chuck
Christophe
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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