Dear R-help,

Could any of you direct me to a function for plotting a grid of colours,
directly specified by a matrix of hex colour codes?  In other words I'm
looking for a heatmap() or image()-like function to which I can specify the
colour of each grid location directly, rather than providing a numerical
matrix and a 1D-colour scale (heatmap, image, levelplots,NeatMap...). I'm
surprised I haven't found anything simple with RSiteSearch,
help.search, net.

I'd like to use this function to encode one variable as "chroma" and a
second as "luminance" (hcl colour space), so that the two variables can be
visualised in a single heatmap (the variable are fold-change and a q-value,
a significance measure). If anyone has any thoughts/warnings to offer re
this idea then I'd love to hear them (it must have been tried before, but
I've not come across any examples) .

Best wishes and thank you,

Peter Davenport

	[[alternative HTML version deleted]]

