Thank you again for your response.  Below is similar to what I ended up doing, i.e. example code:
 
library(plotrix)

ions<-c(3.2, 5.0, 2.0)
ion.names<-c("Na","Ca","Mg")

radial.plot(ions, labels=ion.names, rp.type="s", start=90*(3.14159/180), 
             main="Dissolved ions in water", point.symbols=16, point.col="green", 
             radial.lim=c(0,6), show.centroid=FALSE, cex=4)
 
Now I will try to add on the label.  
 
Also, do you know how to make the radial rings "black" and a little thicker?  A co-worker requested that the be made a little darker and easier to see. 
 
Thanks again.    
 
 
 

--- On Fri, 2/6/09, Jim Lemon <jim@bitwrit.com.au> wrote:

From: Jim Lemon <jim@bitwrit.com.au>
Subject: Re: [R] Target Plot?
To: jasonkrupert@yahoo.com
Date: Friday, February 6, 2009, 4:16 AM

Jason Rupert wrote:
> I had a bit of problems with my email, so if any one responded to this I
may have not received it.   Is there any chance you can repost any ideas you
might have?  Right now I am looking at the plotrix package, but I have not been
able to put together what I'm looking for.    
Hi Jason,
I sent a brief note to check radial.plot in the plotrix package, but you may
have already found this.

Jim



      
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