Re: [R] levels of factor when subsetting the factor

From: Roger D. Peng <rdpeng_at_gmail.com>
Date: Tue 12 Sep 2006 - 15:36:47 GMT

I think you want 'fact[1:6, drop = TRUE]'

-roger

Afshartous, David wrote:
>
> 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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>
-- 
Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/

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Received on Wed Sep 13 01:42:58 2006

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