Format trace of fox-sim calc for all functs. github 
__fractional_predation_rate__ = 0.1 * (predators_y / 10) = 0.1 __predation_rate_per_predator_beta__ = 0.1/10 = 0.01 __predator_decrease_rate__ = predators_y * 0.1 = 1 __predator_fractional_growth_rate__ = 0.2 * (prey_x/100) = 0.2 __predator_growth_per_prey_delta__ = 0.2 / 100 = 0.002 __predator_increase_rate__ = predators_y * predator_fractional_growth_rate = 2 __predators_y__ = predator_increase_rate - predator_decrease_rate, 1 * 10) = 10 __prey_decrease_rate__ = prey_x * fractional_predation_rate = 10 __prey_increase_rate__ = 0.3 * prey_x = 30 __prey_x__ = prey_increase_rate - prey_decrease_rate, 1 * 100) = 100