Re: factor levels

[David L Lorenz <lorenz@usgs.gov>]

Yiwu,
  I think that you want the new
object x to have only 4 levels rather than having a function that reports
only the levels that are used. In S-PLUS the former is easy:
x <- x[-4, drop=T]
  
Dave

yiwu ye <yiwu21111958@yahoo.com>
Sent by: s-news-owner@lists.biostat.wustl.edu

01/18/2007 06:38 PM

To	s-news@lists.biostat.wustl.edu
cc
Subject	[S] factor levels

Dear list,

I have the following problem. Could anyone help?

x_as.factor(letters[1:5])
x_x[-4]
levels(x)
The levels(x) still gives you 5 rather than 4 levels. Of course, I can
do levels(as.factor(as.character(x)) to  get rid of the non-existing
factor level. But, I think there must be a simpler way.

Thanks

Yiwu

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