It seems to be dependent upon the the character ("assigned alphabetically")
which I found out by manually changing the order of appearance of the
characters in rfactor; the colour would stick to the character "a", whether
this appears first in rfactor or not.
I as able to control the colours being used by
> boxplot(x~rfactor, col=c("2", "6", "3","5","4"))
Rgds,
Rainer
Disclaimer:
I'm new to R and very early on the learning curve - just trying my best...
On Saturday 04 December 2010 01:22:56 Eduardo Klein wrote:
> Hi,
>
> I would like to know how R assigns the numeric code to a set of factors
> in a vector. For example, I have a vector of 5 different factors in a
> random order, and I want a color-coded plot by factors:
>
> rfactor=as.factor(sample(letters[1:5], 50, replace=T))
> rfactor
> [1] c c c d b a b d d a a e e b b e c e e a a b b b a b a e a a b d b
> b c a b b
> [39] d c a e c d e d a a a a
> Levels: a b c d e
>
> x=rnorm(50)
> boxplot(x~rfactor, col=1:5)
>
> So, colors 1 to 5 are assigned to factors alphabetically (a-1, b-2, ...,
> e-5), or by order of appearance (c-1, d-2, b-3, a-4, e-5)? It is
> possible to control that?
>
> Saludos, EKS
>
>
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