[R] Square matrix plot

From: Finocchiaro Giacomo <giacomo.finocchiaro_at_ifom-ieo-campus.it>
Date: Tue 09 Aug 2005 - 03:42:21 EST


having a matrix where rows=n and cols=m, I calculated the spearman correlation values of the matrix, this generated a square matrix m x m. Dose anyone knows how can I create a plot similar to this

http://bio.ifom-firc.it/User/finoc/ask.png ( produced with hierarchical cluster explorer)

using R? I would like to have a range of colors from green(-1) to red(+1) proportional to the correlation value calculated. Thanks a lot. Regards

                                Giacomo Finocchiaro

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