[R] null plotting symbol ?

Spencer Graves spencer.graves at pdf.com
Mon May 5 23:09:00 CEST 2003

The following produced symbols of different shapes, sizes, and colors in 
R 1.6.2:

  plot(1:4, pch=1:4, col=1:4, cex=1:4)

The same command to S-Plus 6.1 generated a plot with one symbol, color 
and size, complaining, "Too many values for parameter" pch, col, and cex.

hth.  spencer graves

Peter Dalgaard BSA wrote:
> 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??
> plot(1:10,pch=c(1:4,NA,6:10))
> works for me on Linux, but there could be device dependencies.

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