On Thu, 14 Feb 2008, samsr wrote:
>
> Hi,
>
> I need to plot a matrix using image() such that negative values are easily
> distinguishable from posittive values, while also maintaining a gradation in
> color with magnitude. How can I set ranges for colors in order to achieve
> this. Thanks.
Look at the function diverge_hcl() in package "vcd" which provides
diverging palettes. You can find several examples in
example("diverge_hcl", package = "vcd")
vignette("hcl-colors", package = "vcd")
Further background information is available in this technical report by
Kurt Hornik, Paul Murrell and me
http://epub.wu-wien.ac.at/dyn/openURL?id=oai:epub.wu-wien.ac.at:epub-wu-01_c87
Best,
Z
> Sam
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