[R] two questions associated with heatmap

[Weiwei Shi]

hi, there:
i have 2 questions associated with heatmap

in heatmap.2{gplot}, there is a bar called "raw z-score" showing the
coloring legend for each pixel. Where can I find that z-score's
formulae?

question 2,
for example, I have 5 groups and I want to label each group with a
color name from "#FF0000" to "#0000FF" evenly. so basically i need a
vector like this:
c("#FF0000", ?, ?, ?, "#0000FF")

the number of groups can be 10 or whatever.

thanks.
-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III