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Old 07-09-2014, 08:45 AM   #4
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Location: Stanford

Join Date: Jun 2009
Posts: 181

Look at your histogram. This is a feature of your data, not of the clustering tool. If you only want contrast within that middle range, chop off the tails of your distribution before you put it into heatmap.2, or set your own breaks for the color bins to get the same result.

Also, consider using a two-hue gradient with something neutral (white, gray, black, whatever) in the middle, since your scale has a zero point and the difference between positive vs. negative vs. neither is probably meaningful.
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