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#!/usr/bin/env python
""" Test functions for maximum entropy module.
Author: Ed Schofield, 2003-2005
Copyright: Ed Schofield, 2003-2005
"""
from numpy.testing import assert_almost_equal, TestCase, run_module_suite
from numpy import arange, log, exp, ones
from scipy.maxentropy.maxentropy import logsumexp
class TestMaxentropy(TestCase):
"""Test whether logsumexp() function correctly handles large
inputs.
"""
def test_logsumexp(self):
a = arange(200)
desired = log(sum(exp(a)))
assert_almost_equal(logsumexp(a), desired)
# Now test with large numbers
b = [1000,1000]
desired = 1000.0 + log(2.0)
assert_almost_equal(logsumexp(b), desired)
n = 1000
b = ones(n)*10000
desired = 10000.0 + log(n)
assert_almost_equal(logsumexp(b), desired)
if __name__ == "__main__":
run_module_suite()
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