[R] specifying colors in a heatmap/image -like plot

[kerimcan]

David and Jim, thanks for your help. Your advice was exactly what I needed. 

I tinkled with the "col" argument before but I was trying to assign colors
to numbers with a command like: 

col(1<-"green",2<-"blue")

Usually I need to see an example before I can implement something correctly. 

Thanks again.
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