The circle is not "too large"; it just uses your x-units for the
radius and your plotting region isn't square.
Here are some things to try:
plot(0, 0, xlim = c(-1, 1), ylim = c(-1, 1))
symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)
abline(v = c(-1,1)) # shows that x-units 'fit'
abline(h = c(-1,1)) # shows that y-units don't fit
par(pty = "s") # set up square plot
plot(0, 0, xlim = c(-1, 1), ylim = c(-1, 1))
symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)
# set the y/x-aspect (see ?plot.window)
plot(0, 0, xlim = c(-1, 1), ylim = c(-1, 1), asp = 1)
symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)
-Peter Ehlers
eariasca wrote:
Hello,
I am not able to plot a circle of a given radius using symbols(). In
the example below, the circle appears too large:
plot(0, 0, xlim = c(-1, 1), ylim = c(-1, 1))
symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)
What's happening?
Ery
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Peter Ehlers
University of Calgary
403.202.3921
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and provide commented, minimal, self-contained, reproducible code.
