[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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