Use the col= argument to the heatmap() function to specify the three 
colors you want.  For example:
        x <- matrix(rnorm(50), ncol=5)
        heatmap(x, col=1:3)

Jean



furor <furor1980@gmail.com> wrote on 11/14/2012 03:31:42 AM:
> 
> Hi all,
> 
> I've made a heatmap using '-', '=' and '+' as possible values. However, 
the
> heatmap itself shows more than three colors. How to avoid this?
> 
> Thanks in advance.
> 
> regards

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