[R] ordering levels

[Achim Zeileis]

On Wed, 22 Dec 2004 13:06:02 +0100 Anne wrote:

> 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 

You can do

testf <- factor(as.character(testf), levels = c("red", "blue", "white"))

or simply create testf with the right ordering of levels in the first
place.

hth,
Z

>  (this is for presentation purposes)
> I guess I'm looking for a generalized version of "relevel"...
> 
> Thanks 
> 
> Anne
> 
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