[R] null plotting symbol ?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue May 6 14:04:31 CEST 2003
On Tue, 6 May 2003 partha_bagchi at hgsi.com wrote:
> pch = 26 seems to produce a blank symbol.
More accurately, it plots nothing. (A `blank' symbol' suggests to me that
it plots in the background colour.) That is true *currently* (26-31 are
unassigned), but there is no guarantee that will remain so.
Why would one use that rather than NA, whose meaning is clear?
In brief: what exactly was your point? Were you seriously suggesting
> Prof Brian Ripley <ripley at stats.ox.ac.uk>
> Sent by: r-help-bounces at stat.math.ethz.ch
> 05/05/2003 04:39 PM
> To: tblackw at umich.edu
> cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] null plotting symbol ?
> NAs in pch cause the corresponding points to be omitted.
> On Mon, 5 May 2003 tblackw at umich.edu wrote:
> > I am calling plot() with argument pch as a vector of numeric
> > symbol codes, the same length as x and y. Is there some code
> > which produces no symbol - a blank - so that I can come back
> > with a second call to points() and fill in these locations
> > using a different fill color and a different symbol size ?
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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