07-Jan-2022 19:00:30

diff_test()
  MATLAB/Octave version 9.8.0.1380330 (R2020a) Update 2
  Test diff(), a built-in function for differences
  and approximate derivatives.

diff_trig_test
  For sin(x) at x values spaced by h,
  compute first, second and third differences,
  divided by appropriate power of h,
  and compare to corresponding derivatives.
  Graphics saved as "diff_trig_test1.png"
  Graphics saved as "diff_trig_test2.png"
  Graphics saved as "diff_trig_test3.png"

diff_test():
  Normal end of execution.

07-Jan-2022 19:00:49