Wed Feb 2 18:56:42 2022 tough_ode_test(): Python version: 3.6.9 Solve tough_ode(). parameters: t0 = 0.0 y0 = [1. 1. 1. 1.] tstop = 3.0 tough_solve_ivp(): Solve tough_ode() using solve_ivp(). sol.status = 0 Graphics saved as "tough_solve_ivp_y1.png" Graphics saved as "tough_solve_ivp_y2.png" Graphics saved as "tough_solve_ivp_y3.png" Graphics saved as "tough_solve_ivp_y4.png" tough_ode_test(): Normal end of execution. Wed Feb 2 18:56:43 2022 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.9437734065497D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.9437734065497D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.4718867032748D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.4718867032748D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.9437734065497D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.9437734065497D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.2359433516374D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.2359433516374D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.2924337562716D-17 lsoda-- warning..internal t (=r1) and h (=r2) are such that in the machine, t + h = t on the next step (h = step size). solver will continue anyway in above, r1 = 0.1985399847400D+00 r2 = 0.7310843906790D-18 lsoda-- above warning has been issued i1 times. it will not be issued again for this problem in above message, i1 = 10