[Numpy-discussion] what goes wrong with cos(), sin()

[WolfgangZillig]

Hi,

I'm quite new to numpy/scipy so please excuse if my problem is too obvious.

example code:

import numpy as n
print n.sin(n.pi)
print n.cos(n.pi/2.0)

results in:
1.22460635382e-016
6.12303176911e-017

I've expected something around 0. Can anybody explain what I am doing 
wrong here?