I could not tell from the help file whether rotation of the x labels
is supported in heatmap.2. I did read (perhaps in one of the linked to
help files) that rotation was only allowed with "text" and I was
left wondering if it might be possible to use text(x) and list(rot=90)
as arguments to a scales call.
At any rate, the results of this worked levelplot example from
Sarkar's text is worth considering:
data(Cars93, package="MASS")
library(lattice)
cor.Cars93 <- cor(Cars93[, !sapply(Cars93, is.factor)], use ="pair")
levelplot(cor.Cars93, scales =list(x=list(rot=90)))
--
David Winsemius
On Nov 25, 2008, at 2:19 PM, Jun Ding wrote:
Dear R users,
I have a question regarding how to make row labels readable in a
heat map.
I have successfully made a heat map using function "heatmap.2" in
the package "gplots". However, as there are many rows in the heat
map, I have difficulties labeling them (heatmap.2 provides a
parameter "labRow" to label the row names, but as I have too many
rows, I can not make them readable). Do you have any suggestions to
improve the labeling?
I am thinking about using multiple columns to label the row names
instead of one column(the default in heatmap.2). I have tried to use
"mtext" to write texts on the margin of the heat map, but it could
not work either. Do you think this can work? How can I know the
coordinates of each row in a heat map?
Thank you very much!
Jun
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