[R] changing values

[Prof Brian Ripley]

On Thu, 28 Jun 2001, Antonio Olinto wrote:

> Dear R list members,
>
> I have a factor vector with levels 1, 2, 3 and 4. I want to re-group it:
1 and 2 will be 1 and 3 and 4 will be 2, e.g.:
>
> x <- c(1, 1, 1, 2, 3, 2, 3, 4, ... )
> x <- factor(x)
>
> What I have to do create a new vector where 1 1 1 2 3 2 3 4 ... is
transformed in 1 1 1 1 2 1 2 2 ... ? (I have more than 200 lines in
my dataframe)

> levels(x) <- c(1,1,2,2)
> x
[1] 1 1 1 1 2 1 2 2
Levels:  1 2

is the simplest answer.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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