R help - Jan 2009 - heatmap.2 and three colours for specific ranges‏

Hi,

I hope to show a heatmap with thre colours, no gradation. How to specify
heatmap.2 to map "green" for values less than -1, "gray" for
values between
-1 and 1, and "red" for values greater than 1 ?

Thanks

	[[alternative HTML version deleted]]

a<-matrix(rnorm(36,1,3),6,6)
ifelse(a<(-1),1,ifelse(a<=1&a>=-1,2,3))
heatmap.2(a, col=rev(redgreen(3)))

HTH

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of Daren Tan
Sent: January 6, 2009 11:53 PM
To: r-help at r-project.org
Subject: [R] heatmap.2 and three colours for specific ranges?

Hi,

I hope to show a heatmap with thre colours, no gradation. How to specify
heatmap.2 to map "green" for values less than -1, "gray" for
values between
-1 and 1, and "red" for values greater than 1 ?

Thanks

	[[alternative HTML version deleted]]

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