[R] levels of factor when subsetting the factor

[Doran, Harold]

Just add the following to your code

new.fact = fact[1:6, drop=T]

> new.fact
[1] A A A B B B
Levels: A B 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> Afshartous, David
> Sent: Tuesday, September 12, 2006 11:23 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] levels of factor when subsetting the factor
> 
>  
> All,
> 
> When I take a subset of a factor the reduced factor still 
> maintains all the original levels of the factor when say 
> forming the key in a plot.
> The data is correct, but the variable still "remembers" the 
> original levels.  See below for reproducible code.  Does 
> anyone know how to fix this?
> cheers,
> dave
> 
> fact = as.factor(c(rep("A", 3),rep("B", 3), rep("C", 3))) 
> new.fact = fact[1:6]
> > new.fact
> [1] A A A B B B
> Levels: A B C    ## should only show A B
> 
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