[Rd] Possible bug in factor (PR#531)

[mh.smith@auckland.ac.nz]

The expressions

> x<-factor(x)

and

> class(x)<-"factor"

behave differently when x is already an ordered factor.  It may not be a
bug but it caught me out when I was trying to remove the "orderedness"
from a factor variable. The following R code illustrates the difference.
Is this difference between the 2 commands desirable?

> x<-1:3
> class(x)
NULL
> x<-ordered(x)
> class(x)
[1] "ordered" "factor"
> x<-factor(x)
> class(x)
[1] "ordered" "factor"
> class(x)<-"factor"
> class(x)
[1] "factor"

Murray Smith

--
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Murray H. Smith,      Senior Lecturer in Engineering Statistics
Engineering Science Department
The University of Auckland
Private Bag 92019
Auckland
New Zealand
Phone: +64 9 373 7599 x4517, Fax: +64 9 373 7468
email: mh.smith@auckland.ac.nz
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++



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