[R] Newbie help on dim

[Uwe Ligges]

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
>>>>
>>>>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)
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>>fax: (917) 438-0894
>>
>>______________________________________________
>>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
>>