What would I do if I have something like:

x <- rnorm(1:1000)
y <- rnorm(1:1000)
z <- x + y

and I want the rainbow to increase with z? (i.e., red for lowest z...all the
way up to the last color in the rainbow for the highest z)

On Wed, Sep 17, 2008 at 2:05 PM, stephen sefick <ssefick@gmail.com> wrote:

> plot(1:20, col=rainbow(20))
>
> On Wed, Sep 17, 2008 at 4:58 PM, Gillian Silver <haettulegur@gmail.com>
> wrote:
> > Hi, how can I create a rainbow gradient in R? For example, let's say I
> have
> > a plot of y = x...and I want the plot to go from red -> orange -> yellow
> ->
> > green -> blue -> etc.
> > Right now, I know how to do something like go from red to blue, using the
> > plotrix library:
> >
> > library(plotrix)
> > redToBlue <-
> >
> color.scale(x,redrange=c(0,1),greenrange=c(0,1),bluerange=c(0,1),extremes=c("red","blue"))
> > plot(x, y, col=redToBlue)
> >
> > But I can't figure out how to make the colors a rainbow. (I don't
> understand
> > how the redrange, greenrange, and bluerange parameters in color.scale
> work.)
> >
> > Could someone please help?
> >
> > Thanks!
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Stephen Sefick
> Research Scientist
> Southeastern Natural Sciences Academy
>
> Let's not spend our time and resources thinking about things that are
> so little or so large that all they really do for us is puff us up and
> make us feel like gods. We are mammals, and have not exhausted the
> annoying little problems of being mammals.
>
>        -K. Mullis
>

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