circle_sample_test:
  Compare methods of randomly sampling the unit circle
  with points x = r cos(t), y = r sin(t)

  method 1: r = random, t = 2 pi * random
  method 2: r = sqrt(random), t = 2 pi * random
  method 3: x = random, y = random, reject if 1 < x^2+y^2
  Graphics saved as 'circle_sample1.jpg'
  Graphics saved as 'circle_sample2.jpg'
  Graphics saved as 'circle_sample3.jpg'

circle_sample:
  Normal end of execution.