[R] x,y plot question (two sets of labels)

[Peter Alspach]

Tena koe Jonathan

There are lots of ways - using base graphics or lattice or ggplot.  As a
start, using base graphics:

plot(plothelpX, plothelpA2, col=factor(plothelpB))
points(plothelpX, plothelpA1, col=factor(plothelpB))

You'll also need the pch argument to plot and, presumably, xlab, ylab
and others.

For the key, check the help for legend:

?legend

HTH

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Jonathan Greenberg
> Sent: Thursday, 21 January 2010 12:54 p.m.
> To: r-help
> Subject: [R] x,y plot question (two sets of labels)
> 
> I'm trying to figure out the best way to do a scatterplot 
> using the following data as an example:
> 
> plothelp_x=1:10
> plothelp_A1=sin(plothelp_x)
> plothelp_A2=tan(plothelp_x)
> plothelp_B=c("A","B","C","A","B","C","A","B","C","A")
> 
> (note that all 4 of these vectors have 10 entries each)
> 
> What I would like is to have two plots on the same graph:
> 
> 1) plothelp_A1 vs. plothelp_x
> 2) plothelp_A2 vs. plothelp_x
> 
> I want plot #1 to have a set symbol SHAPE (say, crosses) and 
> plot #2 a different symbol shape (say, dots).  On top of 
> that, I want all points to be color coded based on 
> plothelp_B, e.g. all As are black, all Bs are red, all Cs are 
> blue; e.g a sin point with the letter "A" should be a black 
> cross, a tan point with the letter C should be a red dot.  
> Finally, I'd like two have TWO keys in the graph showing a) 
> what the symbol shapes represent (e.g. cross=sin, dot=tan), 
> and b) what the colors mean.
> 
> Thanks for any help you can give me!
> 
> --j
> 
> -- 
> 
> Jonathan A. Greenberg, PhD
> Postdoctoral Scholar
> Center for Spatial Technologies and Remote Sensing (CSTARS) 
> University of California, Davis One Shields Avenue The Barn, 
> Room 250N Davis, CA 95616
> Phone: 415-763-5476
> AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307
> 
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