[R] how to make the units in x and y axis equal?

From: Haiyong Xu <xuhy_at_ucla.edu>
Date: Wed 17 May 2006 - 17:30:17 EST

Hi there,
I encountered a problem when plotting circles. It looks weird that the radii in x and y axis are different since the default lengths of units in x and y axes are different.
Is there any way to make the units equal? I run the following codes and got a plot attached.

symbols(rep(0,6), rep(0,6), circles = c(5, 15, 25, 35, 45, 55), inches = FALSE, xlim = c(-60,60), ylim = c(-60, 60))


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