On Wed, 26 Oct 2005, Peter Dalgaard wrote:
> "Charles C. Berry" <[EMAIL PROTECTED]> writes:
>
>> Is this a bug?
>>
>> If not, I am curious to know why '[<-.data.frame' was designed to yield
>> a.frame$y != a.frame$z rather than refusing to carry out the operation at
>> all.
>>
>>> a.frame <- data.frame( x=letters[1:5] )
>>> a.frame[ 2:5, "y" ] <- letters[2:5]
>>> a.frame[[ "z" ]][ 2:5 ] <- letters[2:5]
>>> a.frame
>> x y z
>> 1 a b <NA>
>> 2 b c b
>> 3 c d c
>> 4 d e d
>> 5 e <NA> e
>
> It sure looks like a bug, and we're not even prototype-compatible:
>
[stuff deleted]
>
> Why would you expect the operation to be refused?
>
I was having trouble deciding if the use of "whole" in the
Extract.data.frame help page was a warning against creating columns with
only some entries present:
"The replacement methods can be used to add whole column(s)..."
[rest deleted]
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0717
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