Colours that vary continuous in hue
> (d <- qplot(carat, price, data=diamonds, colour=clarity))> > # Change scale label > d + scale_colour_discrete()
> d + scale_colour_discrete("clarity")
> d + scale_colour_discrete(expression(clarity[beta]))
> > # Adjust luminosity and chroma > d + scale_colour_discrete(l=40, c=30)
> d + scale_colour_discrete(l=70, c=30)
> d + scale_colour_discrete(l=70, c=150)
> d + scale_colour_discrete(l=80, c=150)
> > # Change range of hues used > d + scale_colour_discrete(h=c(0, 90))
> d + scale_colour_discrete(h=c(90, 180))
> d + scale_colour_discrete(h=c(180, 270))
> d + scale_colour_discrete(h=c(270, 360))
> > # Vary opacity > # (only works with pdf, quartz and cairo devices) > d + scale_colour_discrete(alpha = 0.9)
> d + scale_colour_discrete(alpha = 0.5)
> d + scale_colour_discrete(alpha = 0.2)
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