[R] Re : Half of a heatmap

From: Neil Shephard <nshephard_at_gmail.com>
Date: Mon, 25 Jun 2007 11:14:40 +0100


> I am trying to produce a heatmap of pairwise correlations, but since the matrix is
> symmetric, I only need either the upper or the lower triangle. I have scoured the
> web and R documentation, but I have not been able to find a way to produce such a
> figure. Is there a simple way to produce a heat map with only the part above or
> below the diagonal?

You might want to check out the LDheatmap() package which can generate the plots you describe. The help indicates that it accepts a matrix of pair-wise linkage disequilibrium measures, one of which is R^2 (the correlation coefficient between loci), but I suspect you could simply pass it a matrix of correlation coefficents.

Hope that helps,

Neil

-- 
"In mathematics you don't understand things. You just get used to
them."  - Johann von Neumann

Email - nshephard_at_gmail.com / n.shephard_at_sheffield.ac.uk
Website - http://slack.ser.man.ac.uk/
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Received on Mon 25 Jun 2007 - 10:20:28 GMT

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