[R] 'symbols' not plotting correct circle radii

Stuart Leask Stuart.Leask at nottingham.ac.uk
Thu Jul 19 11:58:57 CEST 2012

(Oh, and yes I've tried setting 'inches=F', but I then get a circle correct on X axis,  but too large on the Y axis.)

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Stuart Leask
Sent: 18 July 2012 11:03
To: r-help at r-project.org
Subject: [R] 'symbols' not plotting correct circle radii

Hi there. 

I have been plotting some circles using 'symbols', with radii representing my data, but the radii looked incorrect. 

It seems to happen with a single circle too:

Symbols ( 0, 0, circles = 40, xlim = c(-40, 40), ylim= c(-40, 40))

If I put a ruler up to my monitor (technology!)  to compare the radius with the axes, the circle isn't radius 40; it is closer to 15... 

I suspect there is a simple answer.

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