>>>>> Peter Langfelder <peter.langfel...@gmail.com>
>>>>> on Fri, 31 May 2013 16:32:06 -0700 writes:
> Hi all, it appears that plot.hclust disregards the
> argument 'cex'. Up until 2.15.1 (and probably all 2.15.x),
> specifying cex in plot.hclust changed the size of the
> plotted labels on each leaf. In 3.0.0 the character size
> remains the same irrespective of the cex setting. Since
> the help text for plot.hclust does not mention the cex
> argument, it is possible that an "undocumentde feature"
> was simply removed - but it was very useful when it was
> available.
> The following code illustrates the problem:
> data = c(1:20)
> dst = dist(data)
> tree = hclust(dst, method = "a")
> plot(tree, cex = 1)
> plot(tree, cex = 0.5)
> plot(tree, cex = 0.2)
> Under R-2.15 and earlier, the leaf labels would get
> progressively smaller; under 3.0.0, the label size remains
> the same. I tried this both under Windows
> R version 2.15.1 (2012-06-22)
[............]
> R version 3.0.0 (2013-04-03)
[............]
> and under Linux
> R version 3.0.0 Patched
[...........]
> Looking at the source code of plot.hclust leads to
> graphics:::plotHclust which calls .External.graphics,
> which is where my ability to read code quickly stops :)
> I realize that these are not the most recent releases but
> I couldn't find anything mentioning a bug fix for this in
> the changelog, so I assume it has not been fixed.
You are right. Duncan Murdoch found the place (in the C code
indeed), and I've found and fixed the small inconsistency that
happened (between 2.15.x and 3.0.0) when that code was slightly
streamlined and moved to the 'graphics' package.
> Thanks,
> Peter
Thank you Peter, for reporting it in such a precise manner!
Martin Maechler, ETH Zurich
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