Wed Feb  2 18:22:55 2022

spring_ode_test():
  Python version: 3.6.9
  Solve spring_ode().

  parameters:
    mass      =  5.0
    damping   =  2.0
    stiffness =  3.0
    t0        =  0.0
    u0        =  0.0
    v0        =  1.0
    tstop     =  25.0

spring_solve_ivp():
  Use solve_ivp() to solve spring_ode().
  Graphics saved as "spring_solve_ivp_y1.png"
  Graphics saved as "spring_solve_ivp_y2.png"
  Graphics saved as "spring_solve_ivp_phase.png"
  Graphics saved as "spring_solve_ivp_conservation.png"

spring_ode_test():
  Normal end of execution.
Wed Feb  2 18:22:56 2022