R help - May 2005 - names(dist(mat)) gives NULL in R 2.1.0

Dear list,
I do not know if this is a bug.
Let's suppose mat is a matrix derived from this code:
> x<-rnorm(10)
> y<-rnorm(10)
> names(x)<-LETTERS[1:10]
> names(y)<-LETTERS[1:10]
> mat<-cbind(x,y)
Now in R 2.0.1 I have:
> names(dist(mat))
"A" "B" "C" "D" "E"
"F" "G" "H" "I" "J"


In R 2.1.0 I have:
> names(dist(mat))
NULL

I have tried this on Windows (precompiled binary distribution) and on
Linux Mandrake 10.0 (R compiled from source code).
Is this a bug or not?
Thanks in advance,
Elio

-- 
----------------------------------------------------------------------------------
Angelo M. Mineo
Dipartimento di Scienze Statistiche e Matematiche "S. Vianelli"
Universit?? degli Studi di Palermo
Viale delle Scienze
90128 Palermo
url: http://dssm.unipa.it/elio

Elio Mineo <elio_mineo at economia.unipa.it> writes:
> In R 2.1.0 I have:
> 
> > names(dist(mat))
> NULL
> 
> I have tried this on Windows (precompiled binary distribution) and on
> Linux Mandrake 10.0 (R compiled from source code).
> Is this a bug or not?
Not.
>From the NEWS file:
    o   The S3 methods for getting and setting names of "dist" objects
        have been removed (as they provided names with a different
        length from the "dist" object itself).

(some side effects are fixed in 2.1.0-patched)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

> From: Elio Mineo
> 
> Thanks, Peter.
> So, in R 2.1.0 there is no way to get names from a "dist" 
> object, isn't 
> there?
If you are referring to the row names of the matrix from which distances are
computed, see the "Value" section of ?dist, which has:

The object has the following attributes (besides "class" equal to
"dist"):

Size   integer, the number of observations in the dataset. 
Labels optionally, contains the labels, if any, of the observations of the
dataset. 
[...]

Andy
 
 
> Peter Dalgaard wrote:
> 
> >Elio Mineo <elio_mineo at economia.unipa.it> writes:
> >
> >  
> >
> >>In R 2.1.0 I have:
> >>
> >>    
> >>
> >>>names(dist(mat))
> >>>      
> >>>
> >>NULL
> >>
> >>I have tried this on Windows (precompiled binary 
> distribution) and on
> >>Linux Mandrake 10.0 (R compiled from source code).
> >>Is this a bug or not?
> >>    
> >>
> >
> >Not.
> >
> >>From the NEWS file:
> >
> >    o   The S3 methods for getting and setting names of 
> "dist" objects
> >        have been removed (as they provided names with a different
> >        length from the "dist" object itself).
> >
> >(some side effects are fixed in 2.1.0-patched)
> >
> >  
> >
> 
> -- 
> --------------------------------------------------------------
> --------------------
> Prof. Angelo M. Mineo
> Dipartimento di Scienze Statistiche e Matematiche "S. Vianelli"
> Universit?? degli Studi di Palermo
> Viale delle Scienze
> 90128 Palermo
> url: http://dssm.unipa.it/elio
> 
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