[R] how to replace some objects?

[Jacques VESLOT]

similarly:
as.character(factor(c("abca","coma"),labels=c("aaa","bbb")))
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Jacques VESLOT

CNRS UMR 8090
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Zhang Jian a écrit :
> The example is simply.But the other example:
> One column: acba,coma,acmo,acmo,acba,coma
> I want to replace "acba" with "aaa", "coma" with "bbb", and "acmo" with 
> "ddd".
> Like this: aaa,bbb,ddd,ddd,aaa,bbb
> How to do it?
> Thanks.
> 
>  
> On 12/19/06, *Jacques VESLOT* <jacques.veslot at good.ibl.fr 
> <mailto:jacques.veslot at good.ibl.fr>> wrote:
> 
>     you can use as.numeric(factor( )); in your example:
>      > ex <- sample(letters[1:3], 10, T)
>      > ex
>     [1] "b" "b" "c" "b" "a" "a" "b" "b" "a" "a"
> 
>      > as.numeric(factor(ex))
>     [1] 2 2 3 2 1 1 2 2 1 1
> 
>     if the order is different, use levels:
> 
>      > as.numeric(factor(ex, levels=letters[3:1]))
>     [1] 2 2 1 2 3 3 2 2 3 3
> 
>     -------------------------------------------------------------------
>     Jacques VESLOT
> 
>     CNRS UMR 8090
>     I.B.L (2ème étage)
>     1 rue du Professeur Calmette
>     B.P. 245
>     59019 Lille Cedex
> 
>     Tel : 33 (0)3.20.87.10.44
>     Fax : 33 (0)3.20.87.10.31
> 
>     http://www-good.ibl.fr
>     -------------------------------------------------------------------
> 
>     Zhang Jian a écrit :
>      > I want to replace some objects in one row or column.For example,
>      > One colume: a,b,a,c,b,b,a,a,c.
>      > I want to replace "a" with "1", "b" with "2", and "c" with "3".
>      > Like this: 1,2,1,3,2,2,1,1,3.
>      >
>      > How to do it? I donot know how to do it. Thanks.
>      >
>      >       [[alternative HTML version deleted]]
>      >
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