Under Details, the documentation says "[if Rowv or Colv] is 'NULL',
_no reordering_ will be done for the corresponding side." In fact, as
explained elsewhere in the documentation, 'NA' is required, not
'NULL'.
An anonymous expert suggested that I should attach an svn diff file to
this report, so I will.
JD
Index: heatmap.Rd
===================================================================
--- heatmap.Rd (revision 56237)
+++ heatmap.Rd (working copy)
@@ -94,7 +94,7 @@
If either is missing, as by default, then the ordering of the
corresponding dendrogram is by the mean value of the rows/columns,
i.e., in the case of rows, \code{Rowv <- rowMeans(x, na.rm=na.rm)}.
- If either is \code{\link{NULL}}, \emph{no reordering} will be done for
+ If either is \code{\link{NA}}, \emph{no reordering} will be done for
the corresponding side.
By default (\code{scale = "row"}) the rows are scaled to have mean
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