Newbie help on dim

Achim Zeileis wrote:

On Thu, 01 Sep 2005 08:25:14 -0400 Chuck Cleland wrote:

Should the Value: section of the help page read:

For an array (and hence in particular, for a matrix) dim retrieves

the>dim attribute of the object. It is NULL for a vector of mode
integer.


This statement is true, but less general than
  It is NULL or a vector of mode integer.
hence the latter is surely preferred.

Z, in fact, it is not true:

  x <- integer(1)
  dim(x) <- 1
  typeof(x) # "integer"
  dim(x)    # 1

Best,
Uwe

Z

NOTE: for not or in the second sentence.

Uwe Ligges wrote:

Christian Prinoth wrote:

Hi, if I do

Z<-rnorm(50)
Followed by
Dim(Z)
I get NULL. Is this correct? Shouldn't I get 50 instead?

No, because Z has no dim attribute. ?dim tells you:

"For an array (and hence in particular, for a matrix) dim retrieves
the dim attribute of the object. It is NULL or a vector of mode
integer."

TIA
Chris

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