[R] color ranges on a 2D plot

[Petr PIKAL]

r-help-bounces at r-project.org napsal dne 17.01.2008 15:08:40:

> There must be a better way but this will do it for
> you.
> 
> x <- runif(100, 0, 1)
> y <- runif(100, 0, 1)
> z <- data.frame(x,y)
> 
> plot(subset(z, z$y >=.5), col="red", ylim=c(min(z$y),
> max(z$y)), pch=16) 
> points(subset(z, z$y <=.49), col="blue", pch=15)

Other option is to subset vector of colors

colvec<-c("blue", "red")
plot(z, col=colvec[(z$y>=.5)+1])

Regards
Petr


> 
> --- dxc13 <dxc13 at health.state.ny.us> wrote:
> 
> > 
> > useR's
> > 
> > I am trying to color the points on a scatter plot
> > (code below) with two
> > colors.  Red for values 0.5 -1.0 and blue for 0.0 -
> > .49.  Does anyone know a
> > easy way to do this?
> > 
> > x <- runif(100, 0, 1)
> > y <- runif(100, 0, 1)
> > plot(y ~ x, pch=16)
> > 
> > Thanks,
> > dxc13
> > -- 
> > View this message in context:
> >
> http://www.nabble.com/color-ranges-on-a-2D-plot-tp14893457p14893457.html
> > Sent from the R help mailing list archive at
> > Nabble.com.
> > 
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