[R] Ploting NA location points

Martin Maechler maechler at stat.math.ethz.ch
Tue Sep 5 13:27:13 CEST 2000

>>>>> "Trent" == Trent Piepho <xyzzy at speakeasy.org> writes:


    Trent>    plot(x,y, pch=21, bg=c(4,2)[is.na(z)+1])

    Trent> You need to use a point type from 21 to 25 for the background
    Trent> color to show up.
    Trent> To go along with the plot, I suggest something like:

    Trent> 	legend(0,0, c("Non-Missing", "Missing"), fill=c(4,2))

    Trent> The legend will have square boxes of color instead of filled
    Trent> circles like pch=21,bg=c(...) will give you.  I haven't been
    Trent> able to figure out how to get a color filled symbol in a plot
    Trent> legend.  The bg parameter will apply to the background of the
    Trent> entire legend, and not the plotting symbols.
and I took your notice above as a feature request.
It needs (yet) another argument to legend(.), such as

or point.bg
or points.bg
or pch.bg

(not starting with "bg" to avoid misunderstandings with existing argument bg)
I propose to use the first one ..
(and am about to commit that for R-devel aka "R 1.2 to be").

Martin Maechler <maechler at stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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