[R] Newbie help on dim

[Achim Zeileis]

On Thu, 01 Sep 2005 14:44:53 +0200 Uwe Ligges wrote:

> 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

But then:
  is.vector(x) # FALSE
but let's not start nitpicking here.
Z

> 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
> >>>>
> >>>>DISCLAIMER:\ L'utilizzo non autorizzato del presente
> >>>
> >>>messagg...{{dropped}}>
> >>>
> >>>>______________________________________________
> >>>>R-help at stat.math.ethz.ch mailing list
> >>>>https://stat.ethz.ch/mailman/listinfo/r-help
> >>>>PLEASE do read the posting guide!
> >>>
> >>>http://www.R-project.org/posting-guide.html
> >>>
> >>>
> >>>Yes, PLEASE do read the posting guide! 
> >>>http://www.R-project.org/posting-guide.html
> >>>
> >>>
> >>>Uwe Ligges
> >>>
> >>>______________________________________________
> >>>R-help at stat.math.ethz.ch mailing list
> >>>https://stat.ethz.ch/mailman/listinfo/r-help
> >>>PLEASE do read the posting guide!
> >>>http://www.R-project.org/posting-guide.html
> >>>
> >>>
> >>
> >>-- 
> >>Chuck Cleland, Ph.D.
> >>NDRI, Inc.
> >>71 West 23rd Street, 8th floor
> >>New York, NY 10010
> >>tel: (212) 845-4495 (Tu, Th)
> >>tel: (732) 452-1424 (M, W, F)
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> >>
> >>______________________________________________
> >>R-help at stat.math.ethz.ch mailing list
> >>https://stat.ethz.ch/mailman/listinfo/r-help
> >>PLEASE do read the posting guide!
> >>http://www.R-project.org/posting-guide.html
> >>
> 
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