Tue Oct 19 11:24:11 2021

ball_distance_test():
  Python version: 3.6.9
  Test ball_distance().

  Using N = 10000 sample points,
  Estimated mean distance = 1.02878
  Exact mean distance     = 1.02857
  Estimated variance      = 0.144374
  Graphics saved as "ball_distance_histogram.png"
  Graphics saved as "ball_distance_pdf.png"
  Graphics saved as "ball_distance_compare.png"

ball_distance_test():
  Normal end of execution.
Tue Oct 19 11:24:12 2021