Use of colour in plots

Jim,

Thanks for this - I've looked into cluster.overplot in particular which, judging by the help file, sounds quite useful (count.overplot seems less relevant).

I'm finding however, that when I execute cluster.overplot, it simply returns many values (which total the number in the dataset I'm using, 54041), but doesn't produce, or alter my graph! Is this to be expected? If so, what do the ouput values represent? Because not *all* of the values overplot, so I'm confused as to why the number of cluster.overplot output values equals the number of values in my dataset!

Thanks,

Steve



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Date: Fri, 19 Sep 2008 21:57:03 +1000
From: jim at bitwrit.com.au
To: smurray444 at hotmail.com
Subject: Re: [R] Use of colour in plots

Steve Murray wrote:

Greg,

[[elided Hotmail spam]]

One (hopefully final!) question I have is, is there any way of preventing overplotting? I'm finding that many of the red points are being obscured by the greens - I've tried making the point sizes small (cex=0.1) but this doesn't fully solve the problem.

Or even, is there a way of changing the order of which the points are plotted?

Hi again,
Maybe cluster.overplot or count.overplot in the plotrix package?

Jim