R-alpha: factors ...

Wed, May 21, 1997 3:31 AM #

Perhaps someone can enlighten me here:

R> x <- factor(LETTERS[1:3])
R> x
[1] A B C
R> mode(x)
[1] "factor"
R> class(x)
[1] "factor"
R> mode(unclass(x))
[1] "factor"

S-PLUS has

[1] "numeric"

[1] "factor"

[1] "numeric"

???
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Thomas Lumley

Wed, May 21, 1997 8:01 AM #

On Wed, 21 May 1997, Kurt Hornik wrote:

It's a feature. R has a primitive factor type, S-PLUS doesn't and so loses
factorness with unclass(). You can use as.numeric() to coerce to numeric
in either system. 


Thomas Lumley
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