pch=NA (PR#7737)
Please check the current sources (R-2.1.0 alpha). pch = NA is now documented under points(), where all the other values are, and pch="" is now equivalent.
On Tue, 22 Mar 2005 arnima@u.washington.edu wrote:
I'd like to suggest changes to three help pages, regarding the use of
pch=NA to suppress plotting symbols. See below.
Arni
R 2.0.1 on WinXP
===
help(bxp)
===
The argument outpch=" " needs to be replaced with outpch=NA in two places.
I actually wrote this part of the documentation myself at one point, but
have now realized that pch=NA and pch=" " are not the same:
x <- split(rlnorm(26e4), letters)
## NA generates small file
postscript("na.ps"); boxplot(x,outpch=NA); dev.off()
## Space generates large file
postscript("space.ps"); boxplot(x,outpch=" "); dev.off()
space was I am sure intended here.
=== help(par) help(points) === Please specify that pch=NA can be used to suppress plotting symbols. I'm aware of type="n", but pch=NA can be a useful feature inside functions and should be documented somewhere. Other negative-sounding values (-1,0,NULL,""," ") generate different results, and only pch=NA does the job properly.
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