
I am trying to plot two things on one graph, with a y-axis at the left for
one variable, and a y-axis at the right, for the other variable.  I thought
I could do as follows


par(mar=rep(4.5, 4))
plot(0:10, 10:20)
par(new=TRUE)
plot(0:10, 100:110, axes=FALSE)
axis(4)


but this writes both y-axis labels on the left-hand side, and nothing on the
right-hand side.  This is R 2.8.1 (2008-12-22) on OS-X.

Am I missing something?  

PS. I know that I can just make ylab="" and draw the right-hand axis name
with mtext, but that then I would need to check par(mgp), to find where
place it, etc.  I'm thinking that I am just missing something in my
understanding.


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