Wed Apr 28 14:49:07 2021 

midpoint_test()
  R version 3.4.4 (2018-03-15) 
  Test midpoint() for solving ordinary differential equations.

hund_midpoint
  R version 3.4.4 (2018-03-15) 
  Use midpoint() to solve the Hund ordinary differential equation.

stiff_midpoint
  R version 3.4.4 (2018-03-15) 
  Use midpoint() to solve the stiff ordinary differential equation.

midpoint_test():
  Normal end of execution.
Wed Apr 28 14:49:07 2021