matplotlib Code

from pylab import *

def f(t):
    s1 = cos(2*pi*t)
    e1 = exp(-t)
    return multiply(s1,e1)

t1 = arange(0.0, 5.0, 0.1)
t2 = arange(0.0, 5.0, 0.02)
t3 = arange(0.0, 2.0, 0.01)

# create and upper subplot and make it current
subplot(211)
l1, l2 = plot(t1, f(t1), 'bo', t2, f(t2), 'k--')
set(l1, markerfacecolor='g')
grid(True)
title('A tale of 2 subplots')
ylabel('Damped oscillation')

# create a lower subplot and make it current
subplot(212)
plot(t3, cos(2*pi*t3), 'r.')
grid(True)
xlabel('time (s)')
ylabel('Undamped')
savefig('../fig/mpl_subplot_demo')
show()