[R] Problems with factor

[Peter Dalgaard BSA]

ripley at stats.ox.ac.uk writes:

> On Wed, 31 Jul 2002, kjetil halvorsen wrote:
> 
> > Why does I get only the underlying representation, and not the level
> > names, in the following code to recode a factor? Seems like a bug to me.
> 
> You have coercion going on there.  Here is a simpler example:
> 
> > x <- factor(letters)
> > ifelse(x=="a", "a", x)
>  [1] "a"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12" "13" "14" "15"
> [16] "16" "17" "18" "19" "20" "21" "22" "23" "24" "25" "26"

..and even

> c("a",x)
 [1] "a"  "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12" "13" "14"
[16] "15" "16" "17" "18" "19" "20" "21" "22" "23" "24" "25" "26"


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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