Peter Dalgaard wrote:
>
> d <- data.frame(f=c("rare", "medium","well-done"))
> #To get the cast in order of appearance, this can be used:
>
> > d$f <- factor(d$f, levels=unique(d$f))
> > d$f
> [1] rare medium well-done
> Levels: rare medium well-done
>
>
.. which caused some head-scratching from me, because it made me believe
there was some hidden Kopenhagen-factor conserving the original order.
To protect the innocent: for the more general case, unique() does not help.
Dieter
levs = c("rare", "medium","well-done")
set.seed(4711)
d <- data.frame(f=sample(levs,10,TRUE))
unique(d$f)
d$f = factor(d$f, levels=unique(d$f))
levels(d$f)
d$f = factor(d$f, levels = levs)
levels(d$f)
--
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