[R] null plotting symbol ?

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Mon May 5 22:40:34 CEST 2003

tblackw at umich.edu writes:

> 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.  

Doesn't NA work there??


works for me on Linux, but there could be device dependencies.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

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