[R] Large plot symbols (with pch = 1 etc)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Dec 2 11:33:11 CET 1999
> Date: Thu, 2 Dec 1999 20:23:20 +1100 (EST)
> From: John Maindonald <john.maindonald at anu.edu.au>
> On my home (Windows 98) machine I find:
> > par()$cra
>  42 16
> > par()$csi
>  0.1666667
> On my work machine I believe I had
>  17 16
> So it looks as though R is reading the width wrongly,
> and that it is the width that is somehow used to
> determine the plot character size.
> Incidentally I noted Brian's comment that R had misread
> his character dimension information wrongly. I have a
> Matrox MM2 board on my Windows 98 (SE) machine.
> I understand he will be using a Matrox G200. Is there a
> Matrox connection?
It was my laptop (our G200's are primarily Linux), and it is a NeoMagic
256. The problem was with Windows, not R: R acts on what it is told by
Windows, and that was nonsense. I am fairly sure that problem resides
in the graphics drivers, but we need to work around it. Not long
before the release of 0.90.0 he and I were getting very different
font and symbol sizes on our laptops from identical code.
As far as I can see in the Nov 19th change Guido changed the cra
setting to come from the character metrics. That is, cra is set to
what Windows reports as the maximum width of a character in the font.
It looks as if that is unreliable. I think we should ask it for "O".
Incidentally, I am beginning to learn that Window 98SE is not just
a minor upgrade, so we are going to have to test on that too.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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