29 November 2023 8:03:07.955 PM midpoint_test(): FORTRAN90 version Test midpoint(). predator_prey_test() A pair of ordinary differential equations for a population of predators and prey are solved using midpoint(). The exact solution shows periodic behavior, with a fixed period and amplitude. predator_prey_test: data stored in "predator_prey_data.txt". predator_prey_test: plot commands stored in "predator_prey_commands.txt". stiff_test(): Solve stiff ODE using midpoint() plot2: data stored in "stiff_data1.txt" and "stiff_data2.txt". plot2: plot commands stored in "stiff_commands.txt". midpoint_test(): Normal end of execution. 29 November 2023 8:03:07.956 PM