pair correlation function of 3D points

Hi,

I have the coordinates of 3D points and I want to plot the pair 
correlation function of these points 
(https://en.wikipedia.org/wiki/Radial_distribution_function). I wonder 
if it possible to calculate this function with R. Maybe with the 
spatstat library? I tried but I found the way to do this with 3D points 
but not for 3D points.

Could you help me ?

Thank you,

Best regards,

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