[R] Remove levels

[Petr Pikal]

Hi

On 10 Nov 2005 at 14:32, Marc Bernard wrote:

Date sent:      	Thu, 10 Nov 2005 14:32:35 +0100 (CET)
From:           	Marc Bernard <bernarduse1 at yahoo.fr>
To:             	r-help at stat.math.ethz.ch
Subject:        	[R] Remove levels

> Daer All,
> 
> I have a factor  variable, X with 5 levels. When I type tables(X) it
> gives me:
> 
> table(X)
> 1     2   3    4   5 
> 10   5    0   0   0
> 
> How to drop the levels with zeros such that when I will type:
> table(X) it will give me:


see ?factor
table(factor(X))

HTH
Petr


> 
> table(X)
> 1     2   
> 10   5    
> 
> 
> Thank a lot,
> 
> Bernard
> 
> 
> 
> 
> ---------------------------------
> 
> 
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Petr Pikal
petr.pikal at precheza.cz