The following is a very simple function to determine if a function is even,
it works but why does the Travis Cl build test fail? And can someone please
tell me what the test means?
Thanks,
Priyatham
def is_even(f, x):
"""
Determines if a function is even or not.
**Usage**
is_even(function, variable)
**Details**
``function`` can be any function defined in sympy or by the user
``variable`` is the variable with respect to which evenness has to
be determined
Examples
========
>>> from sympy.functions import *
>>> from sympy import is_even
>>> from sympy.core.symbols import symbols
>>> x = symbols('x')
>>> is_even(sin(x), x)
False
>>> is_even(cos(x), x)
True
>>> is_even(x**2, x)
True
References
==========
http://en.wikipedia.org/wiki/Even_and_odd_functions
"""
return simplify(f - f.subs(x, -x)) == 0
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