[R] heatmap

[Andrea Zangrando]

Hi,
i created a graph with heatmap(sma) function:

heatmap(dataHeat(x))

and I wish to change the gradation of colors from blue to red, how could 
i do?
Using "heatmap(dataHeat(x), col=c(2,4))" i will use only 2 colors 
without gradation.

Ty so much
Andrea