[R] monitor linearity

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Thu Sep 9 10:03:37 CEST 1999

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.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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