[Rd] Using strwidth before plotting
Prof Brian D Ripley
Wed, 17 Apr 2002 07:39:22 +0100 (BST)
On Tue, 16 Apr 2002, Duncan Murdoch wrote:
> In the plotcorr() function in the ellipse package, I want to position
> things differently depending on the size of the labels. I can use
> strwidth to find out the length of the labels, but only when there's a
> plot window open: it won't open one.
> Question: What function call says: make sure there's a window open
> (i.e. do what plot() does before it starts plotting)?
Call par(), e.g. par("font")
> I don't think I can use plot.new() or frame(), because I don' t want
> to leave a blank page in the plot history if there was already a
> window open.
(That is indeed what happens.)
You can find if there is a device open by looking at length(.Devices) > 1
or dev.cur() > 1.
Brian D. Ripley, email@example.com
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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