Get plot() bounding box values

Question

I\'m generating numerous plots with xlim and ylim values that I\'m calculating on a per-plot basis. I want to put my legend outside the plot area (

Answer 1

Here's a basic example illustrating what I think you're looking for using one of the code examples from ?legend.

#Construct some data and start the plot
x <- 0:64/64
y <- sin(3*pi*x)
plot(x, y, type="l", col="blue")
points(x, y, pch=21, bg="white")

#Grab the plotting region dimensions
rng <- par("usr")

#Call your legend with plot = FALSE to get its dimensions
lg <- legend(rng[1],rng[2], "sin(c x)", pch=21, 
            pt.bg="white", lty=1, col = "blue",plot = FALSE)

#Once you have the dimensions in lg, use them to adjust
# the legend position
#Note the use of xpd = NA to allow plotting outside plotting region             
legend(rng[1],rng[4] + lg$rect$h, "sin(c x)", pch=21, 
            pt.bg="white", lty=1, col = "blue",plot = TRUE, xpd = NA)