[R] confidence interval

[Francesco Petrogalli]

Hi,
I have a circular shaped set of point on the plane (X,Y) centered in
zero. The distribution is more dense close to zero and less dense far
from zero.

I need to find the radius of a circle centered in zero that contains
65% of the points in the sample. Is there any R directive that can do
this?

I wanna start with 2D set of points, but the real case scenario is
with a 5D set of points.

Thanks,

Francesco