6 October 2025   6:33:48.540 PM
 
rk4_test():
  Fortran90 version.
  Test rk4().
 
rk4_predator_test
  Use rk4() to solve the predator prey ODE.

predator_phase_plot():
  Write command and data files that can be used
  by gnuplot for a predator-prey phase plot.
 
  predator_phase_plot: data stored in "predator_data.txt".
  predator_phase_plot: plot commands stored in "predator_commands.txt".
 
rk4_test():
  Normal end of execution.
 
 6 October 2025   6:33:48.542 PM