[R] Similarity matrix

Frank E Harrell Jr fharrell at virginia.edu
Tue Apr 10 22:55:59 CEST 2001

I frequently use hclust on a similarity matrix.  In R only a
distance matrix is allowed.  Is there a simple reliable
transformation of a similarity matrix that will result
in a distance matrix making hclust work the same as
S-Plus with a similarity matrix?  Venables & Ripley 3rd
edition implies that a simple reversal of values
will suffice.  Thanks -Frank
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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