Hi,

I was just trying to get a heatmap of sorts with data that has only 3 values (-1,0,1). For example:

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library(stats)
 eg <- matrix(-1:1,10,10)
 rownames(eg) <- LETTERS[1:10]
 colnames(eg) <- c(1:10)
 heatmap(eg)

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However, the heatmap that I get has 5 colors. What do I need to do so that only 3 colors (each representing one of 1,0,-1) are displayed?

thanks!


      
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