Plot points outside plotting region in R

问题

I want to add points(asterisks) outside the plotting region of a plot in R. However, the following code only allows points to be added inside the plotting region:

x = c(1:10)
y = c(1:10)
plot(x,y)
points(11, 7, pch = 8)

How can I adjust code to allow the point to be plotted outside the plotting region?

回答1:

This SO post might help! It's about legends, but you can probably apply the same method for what you want.

This worked for me:

> par(xpd=TRUE)
> x = c(1:10)
> y = c(1:10)
> plot(x,y)
> points(11, 7, pch = 8)

回答2:

One way:

plot(1:10, 1:10)
par(new = TRUE, mar = c(0,0,0,0))
plot(1:10, 1:10, xaxt = 'n',yaxt='n')

来源：https://stackoverflow.com/questions/11417269/plot-points-outside-plotting-region-in-r