Robin Hankin wrote:
Hi everyone
I want a square scatterplot with abline(0,1) going exactly through the SW and NE corners. By "square" I mean that the plotting region is exactly square, and that the axis limits are identical.
x <- 1:20 y <- x+rep(c(-1,1),10) lims <- range(c(x,y))
None of the following do this:
plot(x,y) ; abline(0,1) #not square plot(x,y,asp=1);abline(0,1) #diagonal line misses corners
plot(x,y,asp=1,xaxs="i",yaxs="i");abline(0,1) #diagonal line misses corners
plot(x,y,xaxs="i",yaxs="i");abline(0,1) #not square and diag misses corners
plot(x,y,xlim=lims,ylim=lims,xaxs="i",yaxs="i");abline(0,1) #not square
plot(x,y,asp=1,xlim=lims,ylim=lims,xaxs="i",yaxs="i");abline(0,1) #not square (plotting region about 8cm by 9.5cm)
If I wrap the above lines in
postscript(file="foo.ps", width=5,height=5) [...snip...] dev.off()
then still none of the plots is exactly right [either one or both corners are missed, or the aspect ratio off]. What am I missing?
But the margins are all different which is throwing you off. How about:
par(mar = c(4, 4, 4, 4)) plot(x, y, asp = 1) abline(0, 1)
HTH -sundar
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