pch = 26 seems to produce a blank symbol.





Prof Brian Ripley <ripley@stats.ox.ac.uk>
Sent by: r-help-bounces@stat.math.ethz.ch
05/05/2003 04:39 PM

 
        To:     tblackw@umich.edu
        cc:     r-help@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@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@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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