[R] ColorRamp different from ColorRampPalette

hadley wickham h.wickham at gmail.com
Fri Apr 17 21:59:48 CEST 2009


Look at the output of pal.cr((0:40)/40)
Hadley

On Fri, Apr 17, 2009 at 2:42 PM, Etienne B. Racine <etiennebr at gmail.com> wrote:
>
> I try to use ColorRamp as ColorRampPalette (i.e. with the same gradient), but
> it seems there is a nuance that I've missed.
>
> pal.crp<-colorRampPalette( c("blue", "white", "red"), space = "rgb")
> plot(rep(0,40),pch=16,col=pal.crp(40))
> # is great
>
> But, using the same gradient with colorRamp is giving erratic colors.
>
> pal.cr<-colorRamp( c("blue", "white", "red"), space = "rgb")
> plot(rep(0,40),pch=16,col=pal.cr((0:40)/40))
> # is not great
>
> >From the help : "colorRamp returns a function that maps values between 0 and
> 1 to colors" ...colors I guess taken from the gradient, but I don't get the
> gradient.
>
> Etienne
>
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