Re: [Rd] pch=NA (PR#7737)

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Tue 22 Mar 2005 - 08:06:48 GMT

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

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Received on Tue Mar 22 19:09:19 2005

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