Dear All:

I tried to use heatmap.2 to generate hierarchical clustering using the following command:

heatmap.2(datamatrix, scale="row", trace="none", col=greenred(256), labRow=genelist[,1], margins=c(10,10), Rowv=TRUE, Colv=TRUE)

datamatrix is subset of a RMA normalized data subset by a genelist. 

The problem is a lot of times, the z-score in key are from, like -5 to 15 or -15 to 5, as a result, the zero of z distribution are are either green region or red region of
the key, the resulting heatmap are either generally greenish or redish.

I wonder if there is a way to make the heatmap more balanced between red and green, I tried to read the heatmap.2 help but could not get a clear idea.

Thanks
Hao


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