[R] comparing heatmaps

[Benton, Paul]

Dear all,

I've been trying to find how to compare tow different heatmaps but I'm having trouble getting the colors bar to be the same. I'm doing something like the following:

library(gplots)
dat<-cor(matrix(rnorm(100, m=10), nrow=10))
mat<-cor(matrix(rnorm(100), nrow=10))
dev.new()
heatmap.2(mat, Rowv=NA, Colv=NA, col=redgreen(75), symm=TRUE, trace="none", dendrogram="none",
 				main = paste("Correlation Matrix for time delay at ", sep=""))
dev.new()
heatmap.2(dat, Rowv=NA, Colv=NA, col=redgreen(75), symm=TRUE, trace="none", dendrogram="none",
 				main = paste("Correlation Matrix for time delay at ", sep=""))


You'll probably notice that the color bar at the top left isn't the same scale. How do I do this?

Thanks,

Paul