[R] ordering levels: I was wrong

[BXC (Bendix Carstensen)]

I was wrong about needing the Relevel from the Lexis package.

The default verson of relevel does the job of reshuffling levels
in any desired order, albeit with a warning (which comes from the
fact that apparently only a single number had been anticipated by 
the designer):

> testf <- factor( sample( letters[1:4], 100, replace=T ) )
> table( testf, newf=relevel( testf, ref=c(3,2,1,4) ) )
     newf
testf c  b  a  d 
    a  0  0 21  0
    b  0 21  0  0
    c 32  0  0  0
    d  0  0  0 26
Warning message: 
the condition has length > 1 and only the first element will be used in:
if (is.na(ref)) stop("ref must be an existing level") 

Bendix Carstensen
----------------------
Bendix Carstensen
Senior Statistician
Steno Diabetes Center
Niels Steensens Vej 2
DK-2820 Gentofte
Denmark
tel: +45 44 43 87 38
mob: +45 30 75 87 38
fax: +45 44 43 07 06
bxc at steno.dk
www.biostat.ku.dk/~bxc
----------------------



> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Anne
> Sent: Wednesday, December 22, 2004 1:06 PM
> To: R list
> Subject: [R] ordering levels
> 
> 
> Hello!
> I would like to know if there is a simple way to reorder 
> levels of a given factor.Let's say  that the  vector
> testf<-factor(c("red","red","red","blue","blue","white")) 
>   levels(testf)  : blue red white 
> 
> should have reordered levels  such as 
>  levels(testf)  : red blue  white 
> 
>  (this is for presentation purposes)
> I guess I'm looking for a generalized version of "relevel"...
> 
> Thanks 
> 
> Anne
> 
> ----------------------------------------------------
> Anne Piotet
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> Email: anne.piotet at m-td.com
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