14 September 2021   7:36:17.924 PM

predator_prey_ode_test:
  FORTRAN90 version
  Test predator_prey_ode using euler, midpoint.

  parameter values:
    alpha =    2.00000    
    beta  =   0.100000E-02
    gamma =    10.0000    
    delta =   0.200000E-02

predator_prey_euler

  A pair of ordinary differential equations for a population
  of predators and prey are solved using euler().
 
  predator_prey_euler: data stored in "predator_prey_euler_data.txt".
  predator_prey_euler: plot commands stored in "predator_prey_euler_commands.txt".

predator_prey_midpoint 

  A pair of ordinary differential equations for a population
  of predators and prey are solved using midpoint_fixed().

  The exact solution shows periodic behavior, with a fixed
  period and amplitude.
 
  predator_prey_midpoint: data stored in "predator_prey_midpoint_data.txt".
  predator_prey_midpoint: plot commands stored in "predator_prey_midpoint_commands.txt".

predator_prey_ode_test:
  Normal end of execution.

14 September 2021   7:36:17.926 PM