[Rd] is.matrix

[Daniel Høyer Iversen]

> That's confusing!  In what situations is x a matrix but does not have
> a dim attribute?

That was my point. I don't find it logical that
is.matrix(a) gives FALSE but
is.matrix(t( t(a) )) gives TRUE.

I also think it would be more logical that
a=c(1,1,2)
dim(a) gives 3 1 instead of NULL,



Daniel



On Tue, Nov 11, 2008 at 8:21 PM, hadley wickham <h.wickham at gmail.com> 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?
>
> Hadley
>
> --
> http://had.co.nz/
>
>