#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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