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 [EMAIL PROTECTED] 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, [EMAIL PROTECTED] 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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