Wacek Kusnierczyk wrote:
> hadley wickham wrote:
>
>>> | is.matrix| returns |TRUE| if |x| is a matrix and has a |dim <dim.html>|
>>> attribute of length 2) and |FALSE| otherwise
>>>
>>>
>> That's confusing! In what situations is x a matrix but does not have
>> a dim attribute?
>>
>>
>>
>
> x = matrix(1,1,1)
> dim(x) = c(1,1,1)
> is.matrix(x)
> # no
> is("matrix", x)
> # no
> is(x)
> # hm...
>
> following the last, there would be a situation in which an object is a
> matrix (per is(...)) and has a dim attribute of length != 2, but is a
>
but is *not*
> matrix (per is.matrix(...) and is("matrix", ...), consistently with the
> docs).
>
> (the redundant "vector" in is(x) could probably be removed?)
>
> vQ
>
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