Grid Lines

import numpy as np

import matplotlib.pyplot as plt

def f(t):

return np.exp(-t) * np.cos(2*np.pi*t)

def g(t):

return np.sin(t) * np.cos(1/(t+0.1))

t1 = np.arange(0.0, 5.0, 0.1)

t2 = np.arange(0.0, 5.0, 0.02)

plt.subplot(212)

plt.plot(t1, g(t1), 'ro', t2, f(t2), 'k')

plt.grid(color='b', alpha=0.5, linestyle='dashed', linewidth=0.5)

plt.show()