hadley wickham wrote: > On Tue, Nov 11, 2008 at 1:58 PM, Wacek Kusnierczyk > <[EMAIL PROTECTED]> wrote: > >> hadley wickham wrote: >> >>> On Tue, Nov 11, 2008 at 1:42 PM, Wacek Kusnierczyk >>> <[EMAIL PROTECTED]> 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) >>>> >>>> >>> I think you meant >>> dim(x) <- c(3, 1) >>> >>> You created a 1 x 1 x 1 array. >>> >>> >> i know, that's precisely what i wanted. this is a simple 3d structure, >> yet is(x) reveals it is a matrix. that was the point. >> > > I think the message here is not to use is(). is() is designed for use > with S4 objects, and it doesn't always give what you'd expect for > primitive objects. fine if it could issue a warning when used in conflict with the message.
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