Re: [Rd] Ordering of values returned by unique

From: Tony Plate <>
Date: Thu 30 Sep 2004 - 03:23:42 EST

"Blue book" and "Green book" are nicknames for books that are primary references for the S language, see FAQ 3.1.

"MASS 4th Ed" is W. N. Venables and B. D. Ripley (2002), "Modern Applied Statistics with S. Fourth Edition". Springer, ISBN 0-387-95457-0

At Wednesday 10:39 AM 9/29/2004, Earl F. Glynn wrote:
>"Tony Plate" <> wrote in message
> > I depend on this all the time, so I also checked some references. In the
> > Blue book the documentation for the functions unique and duplicated is
> > combined and implies the above. In MASS 4th Ed, the page referred to by
> > the index entry for 'unique' (p48, #9 in my copy) states that 'unique'
> > removes duplicates as identified by 'duplicated', which implies that the
> > order of retained elements is not changed. The Green book has no index
> > entry for 'unique'. In S-plus the implementation of unique.default(x)
> > x[!duplicated(x)].
>So what is the "Blue book", the "Green book", and MASS 4th Ed?
> mailing list
> mailing list Received on Thu Sep 30 03:27:55 2004

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