Change label size of Cluster Dendrogram in R 3.01

Question

Has anybody found a workaround to the apparent bug in R 3 which prohibits changing the label size on a Cluster Dendrogram?

The following code used to work fine before updating R to 3.01 (prior version was 2.15 I think):

plot(hclust, labels = data[, 1], cex = 0.3)

Now there is no change to label size when altering the cex argument.

Solution

You could set the cex parameter using the par() function before the call to plot(). For example:

# example from ?hclust
hc <- hclust(dist(USArrests), "ave")

# default label size
plot(hc, xlab="xlab", ylab="ylab", main="main", sub="")

# reduced label size
par(cex=0.3, mar=c(5, 8, 4, 1))
plot(hc, xlab="", ylab="", main="", sub="", axes=FALSE)
par(cex=1)
title(xlab="xlab", ylab="ylab", main="main")
axis(2)