28-Jul-2021 00:20:07

diff_test()
  MATLAB/Octave version 9.9.0.1467703 (R2020b)
  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.

28-Jul-2021 00:20:27