Vectorization (2)

A mathematical function written for scalar arguments can (normally) take array arguments:

>>> def f(x):
...     return x**2 + sinh(x)*exp(-x) + 1
...
>>> # scalar argument:
>>> x = 2
>>> f(x)
5.4908421805556333

>>> # array argument:
>>> y = array([2, -1, 0, 1.5])
>>> f(y)
array([ 5.49084218, -1.19452805,  1.        ,  3.72510647])