Newbie help on dim

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.

NOTE: for not or in the second sentence.
NO!!! The help page is correct!

The *value* is either NULL *or* a vector of mode integer.
It is always NULL for any vector without dim attribute (also for 
character vectors!):

  x <- "a"
  dim(x) # NULL
  dim(x) <- 1
  dim(x) # 1

Uwe Ligges
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

DISCLAIMER:\ L'utilizzo non autorizzato del presente 
messagg...{{dropped}}

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Uwe Ligges

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Newbie help on dim

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