[R] monitor linearity

gordon.harrington@uni.edu gordon.harrington at uni.edu
Fri Sep 10 21:55:11 CEST 1999

Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk> writes:

> gordon.harrington at uni.edu writes:
> > demo("graphics") notes that a circle (piechart) is a test of monitor
> > linearity. With a new monitor on a new linux system with R-0.65.0 I get
> > an ellipse. This is not a pincushion effect and the major/minor axis ratio
> > is constant over size and screen location variation. Is this a hardware
> > problem or are there alternative possible explanations to explore?
> (Actually, I always though that referred to the colour scale...) 
> I get circles. Well, close enough anyway...
> I suspect that your hardware is giving rectangular pixels. What's the
> resolution of your display? It is possible to set up X with a non-4:3
> aspect ratio (i.e. 800x600, 1024x768, 1152x864, ...) which might be
> what is happening to you. Or maybe the monitor itself isn't 4:3.

The diagnosis is correct and led to the discovery of a hardware problem which
was new both to Micron and to Sony. The monitor is being replaced by Micron.

Thanks for the help.

Gordon M. Harrington		Mail:	3720 Village Place, #6308
Professor Emeritus			Waterloo, IA 50702-5848
University of Northern Iowa 	Phone:	319-291-8535
gordon.harrington at uni.edu	Fax:	319-291-8491
dryfly at aya.yale.edu			319-291-8324

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