[R] Colors vector based on group

[Achim Zeileis]

On Mon, 6 Feb 2012, Filoche wrote:

> Hi everyone.
>
> I have a vector like this:
>
> x =
> c(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,2,2,2,2,2,2,2,2)
>
> I would like to associate a colour to each of these entry. For example, I
> could use /topo.colors(3)/ (since I have 3 groups).
>
> I know it is easy to do this with  /if/else/ statements, but I would like to
> find a proper way to do this.

Simply use 'x' for subsetting, i.e., with your example topo.colors(3)[x].

See also the packages 'colorspace' or 'RColorBrewer' (amongst others) for 
different color palettes.

hth,
Z

> Thanks in advance,
> Phil
>
>
>
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