[R] Legend symbols mixed char and integer

Prof Brian Ripley ripley at stats.ox.ac.uk
Sun Nov 28 08:54:43 CET 2010

On Sat, 27 Nov 2010, Mike Prager wrote:

> Dear Gurus,
> R 2.11.1 on Windows XP.
> This is a problem in interaction between R and pdftex.
> I need to generate a plot with both open and filled circles. It is
> simple enough, using pch=1 and pch=16.
> The R pdf graphics output is going into pdftex 1.40.10 (MikTeX 2.8).
> The R pdf is correct when viewed in other viewers. However, pdftex
> fills the open circles.  I can work around this problem by using
> pch="o" for the open circles. However, that messes up the figure
> legend.
> Is it possible to use the pch argument of legend() to specify both a
> symbol number and a character? I haven't found the way.

You don't need to.  pch="o" is the same as pch=111 (the ASCII number). 
See ?points.

> Or is there some known work-around for the pdftex bug?

Well, pdftex is not a viewer and does not of itself process PDF 
inclusions, but see ?pdf and the 'useDingbats' argument.

If you really think this is a bug in your LaTeX system, you should 
report it.  But you haven't shown us reproducible code, and similar 
things have worked for me in the past.

> Thanks!
> --
> Mike Prager, NC, USA

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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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