[R] heatmap scale parameter question

[Witold E Wolski]

Would anyone of the more experienced r-users explain to me the
behaviour of the scale parameter in the heatmap function.

different options for scale (R 3.0.1) do change only the colors but do
not affect the dendrograms. Please see for yourself executing the
following code:

d <- matrix(rnorm(100),nrow=20)
stats::heatmap(d)
X11()
heatmap(d,scale="column")
X11()
heatmap(d,scale="row")
X11()
heatmap(d,scale="none")

In all four above cases the dendrograms look exactly the same
However, scaling clearly affects clustering. see:

d <- scale(d)
heatmap(d,scale="none")


best regards

R version 3.0.1 (2013-05-16) -- "Good Sport"
ciao

--
Witold Eryk Wolski


-- 
Witold Eryk Wolski