def test_log_difference(self):
'''
Test the log_difference function by using it to add the logs of 10.000 randomly
generated numbers in [0,1)
'''
for i in xrange(10000):
first_num = self.random_generator.random()
second_num = self.random_generator.random()
first_log = log(first_num)
second_log = log(second_num)
# make sure the first argument is always bigger than the second
if (first_num >= second_num):
result = first_num - second_num
# allow for numerical imprecision up to 1/10000
self.assertTrue(
abs(result -
exp(log_difference(first_log, second_log))) < 0.0001)
else:
result = second_num - first_num
# allow for numerical imprecision up to 1/10000
self.assertTrue(
abs(result -
exp(log_difference(second_log, first_log))) < 0.0001)
def test_log_difference_valueError(self):
'''
Test whether a ValueError is thrown if the second argument is >= than the first.
'''
first_num = self.random_generator.random()
second_num = self.random_generator.random()
with self.assertRaises(ValueError):
if first_num <= second_num:
log_difference(first_num, second_num)
else:
log_difference(second_num, first_num)
def test_log_difference_valueError(self):
'''
Test whether a ValueError is thrown if the second argument is >= than the first.
'''
first_num = self.random_generator.random()
second_num = self.random_generator.random()
with self.assertRaises(ValueError):
if first_num <= second_num:
log_difference(first_num, second_num)
else:
log_difference(second_num, first_num)
def test_log_difference(self):
'''
Test the log_difference function by using it to add the logs of 10.000 randomly
generated numbers in [0,1)
'''
for i in xrange(10000):
first_num = self.random_generator.random()
second_num = self.random_generator.random()
first_log = log(first_num)
second_log = log(second_num)
# make sure the first argument is always bigger than the second
if (first_num >= second_num):
result = first_num - second_num
# allow for numerical imprecision up to 1/10000
self.assertTrue(abs(result - exp(log_difference(first_log, second_log))) < 0.0001)
else:
result = second_num - first_num
# allow for numerical imprecision up to 1/10000
self.assertTrue(abs(result - exp(log_difference(second_log, first_log))) < 0.0001)
