[R] null plotting symbol ?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon May 5 22:39:46 CEST 2003
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 ?
> There's always a work-around, but both x and y are generated
> on the fly by calls to cumsum(), so it's inconvenient to put
> NAs into either x or y to suppress plotting that way. Guess
> I should *try* mixing numeric and character symbol codes,
> although the example in help("points") explicitly uses a list
> at that point.
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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