[R] colour palette for positive/negative range

[Achim Zeileis]

On Fri, 18 Mar 2011, Frank Schwach wrote:

> Hi,
>
> I'm plotting a heatmap with values ranging from -10 to +10 and I would
> like the negative values to show up in shades of blue and the positive
> ones in shadea of red. Basically, I want exactly what the RColorBrewer
> palette RdBu does but with more of a gradual change (the RdBu can only
> give me 11 distinct colours). Any suggestions?

See the function diverge_hcl() in the package "colorspace" which provides 
a wide variety of HCL-based color palettes. These are similar in spirit to 
the ColorBrewer palettes but were designed to provide more fine control. 
See the examples and the associated CSDA paper for more details.

Best,
Z

> Thanks!
>
> Frank
>
>
>
>
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