Take a look at eqscplot() in package MASS for a different approach.
You last para forgets that once you have set the device region and the
margins the physical plot region and hence its aspect ratio is determined
-- see the figures in 'An Introduction to R'.
On Sun, 20 Jul 2008, David Epstein wrote:
#See David Williams' book "Weighing the odds", p286
y <- c(1.21, 0.51, 0.14, 1.62, -0.8,
0.72, -1.71, 0.84, 0.02, -0.12)
ybar <- mean(y)
ylength <- length(y)
ybarv <- rep(ybar, ylength)
x <- 1:ylength
plot(x,y,asp=1,xlab="position",ylab="ybar",type="n",ylim=c(-1,1))
segments(x[1], ybar, x[ylength], ybar)
segments(x,ybarv,x,y)
points(x, ybarv, pch=21, bg="white")
points(x,y,pch=19,col="black")
With asp=1, the value of ylim seems to be totally ignored, as in the above
code. With asp not set, R plays close attention to the value of ylim. This is
not intuitive behaviour, or is it?
How can I set the aspect ratio, and simultaneously set the plot region? The
aspect ratio is one number and the plot region is given by four numbers
(xleft, xright, yleft, yright). Logically, these 5 numbers are independent of
each other and arbitrary, provided xleft<xright and yleft<yright. This should
give a one-to-one bijection between 5-tuples and plots, determined up to a
change of scale that is uniform in the x- and y-dirctions. My code above
shows the (to me) obvious attempt, which fails.
Thanks
David
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
