Newbie help on dim

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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