Python Forum

Hello
I'm relatively new to Python and am not sure how to best display multiple plots in Spyder.
The code below always displays the last plot (each single one works - tested by putting the last one(s) in '''...'''). Can somebody please help me with this?

My Code:

# pip install control

import numpy as np
import control
import matplotlib.pyplot as plt
from control.matlab import *

#     4s+1
#   ---------
#   2s^2+5s-2
num = np.array([4, 1])
den = np.array([2, 5, -2])

# Transfer Function
H = control.tf(num, den)
print('H(s) =', H)

# Zeros
z = control.zero(H)
print('z =', z)

# Poles
p = control.pole(H)
print('p =', p)

# P-Z Map-------------------------------------- 1st plot
control.pzmap(H)

# Bode Plot------------------------------------ 2nd plot
mag, phase, omega = control.bode(H)

# Step Response-------------------------------- 3rd plot
t, y = control.step_response(H)
plt.plot(t, y)
plt.title("Step Response")
plt.grid()

# lsim------------------------------------------ 4th plot
t = np.arange(0, 20, 0.01)
w0 = 3
u = np.cos(w0*t)
yout, T, xout = lsim(H, u, t, X0=0.0)
plt.plot(t, yout)
plt.grid()
plt.show()