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()
===
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.
______________________________________________
R-devel@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
