heatmap.2 adapting the colour scale and text overlay

Hello,

I am using heatmap.2 from the gplots library to plot a small  
symmetrical matrix.

This is the command:

heatmap. 
2 
(tempHeat 
,symm 
= 
T 
,trace 
="none",cexRow=0.7,cexCol=0.7,col="redgreen",density.info="none")

I have a couple of questions:
1) The range is from -0.2 to 0.4 and the colour scheme I am using is  
redgreen.  What I would like is that a zero value to be black, 0.4  
strong green and -0.2 red.  Is this possible?  At the moment around  
0.1 is black.
Perhaps:
color.palette = colorRampPalette(c("green", "black", "pink", "red"))
  heatmap.2(tempHeat,symm=T,trace="none",cexRow=0.7,cexCol=0.7,  
col=color.palette, density.info="none")
2) Is it possible to overlay text on the squares of colour?  How  
ould one go about doing that.

I am happy to use another heatmap function if ti would be better.  I  
am not using the original heatmap as it does not provide a colour key.

Thanks

Dan
-- 
**************************************************************
Daniel Brewer, Ph.D.

Institute of Cancer Research
Molecular Carcinogenesis
Email: daniel.brewer at icr.ac.uk
**************************************************************

The Institute of Cancer Research: Royal Cancer Hospital, a  
charitable Company Limited by Guarantee, Registered in England under  
Company No. 534147 with its Registered Office at 123 Old Brompton  
Road, London SW7 3RP.

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heatmap.2 adapting the colour scale and text overlay

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