[R] coercing "numeric" components of data frame to "factor" or "ordered"?

[Russell Senior]

>>>>> "Andy" == apjaworski  <apjaworski at mmm.com> writes:

Andy> I am not sure if this is the best way, but one way to do this is
Andy> simply to call the as.factor function.  Here is a trivial
Andy> example.

  > x <- c(1, 1, 2, 2, 2, 4, 5, 5) 
  > y <- rnorm(length(x)) 
  > dd <- data.frame(x, y) 
  > dd$x <- as.factor(dd$x)

Andy> Now the x component is a factor.

It looks like if I then do:

> attr(dd$x,"levels") <- c("a","b","d","e")

I can "poke" new factor labels into the data frame (being careful to
align the new alphabetic levels with the previously numeric levels):

> dd
  x            y
1 a  1.493814499
2 a -1.146225474
3 b  0.004065931
4 b -1.426267694
5 b -0.084461051
6 d -0.094001987
7 e -0.631636358
8 e  0.227095141

I guess that'll work for me.  Thanks!


-- 
Russell Senior         ``The two chiefs turned to each other.        
seniorr at aracnet.com      Bellison uncorked a flood of horrible       
                         profanity, which, translated meant, `This is
                         extremely unusual.' ''                      
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