#!/usr/bin/python
# -*- coding: utf-8 -*-
# cosinusoïde amortie

from pylab import *

def my_func(t):        
    s1 = cos(2*pi*t)        
    e1 = exp(-t)        
    return s1*e1

tvals = arange(0., 5., 0.05)
#plot(tvals, my_func(tvals))

#show()

plot(tvals, my_func(tvals), 'bo', tvals, my_func(tvals), 'k')

show()