def test_hypot():
'''
Special cases where derivatives cannot be calculated:
'''
x = ufloat(0, 1)
y = ufloat(0, 2)
# Derivatives that cannot be calculated simply return NaN, with no
# exception being raised, normally:
result = umath_core.hypot(x, y)
assert test_uncertainties.isnan(result.derivatives[x])
assert test_uncertainties.isnan(result.derivatives[y])
def test_hypot():
'''
Special cases where derivatives cannot be calculated:
'''
x = ufloat(0, 1)
y = ufloat(0, 2)
# Derivatives that cannot be calculated simply return NaN, with no
# exception being raised, normally:
result = umath.hypot(x, y)
assert test_uncertainties.isnan(result.derivatives[x])
assert test_uncertainties.isnan(result.derivatives[y])
err_msg = 'A proper exception should have been raised'
# An exception must have occurred:
if sys.version_info >= (2, 6):
assert err_type == ValueError, err_msg
else:
assert err_type == OverflowError, err_msg
try:
result = umath.pow(negative, positive)
except ValueError:
# The reason why it should also fail in Python 3 is that the
# result of Python 3 is a complex number, which uncertainties
# does not handle (no uncertainties on complex numbers). In
# Python 2, this should always fail, since Python 2 does not
# know how to calculate it.
pass
else:
if sys.version_info >= (2, 6):
raise Exception('A proper exception should have been raised')
else:
assert test_uncertainties.isnan(result.nominal_value)
assert test_uncertainties.isnan(result.std_dev)
def test_power_wrt_ref():
'''
Checks special cases of the umath.pow() power operator.
'''
test_uncertainties.power_wrt_ref(umath.pow, math.pow)
err_msg = 'A proper exception should have been raised'
# An exception must have occurred:
if sys.version_info >= (2, 6):
assert err_class == ValueError, err_msg
else:
assert err_class == OverflowError, err_msg
try:
result = umath.pow(negative, positive)
except ValueError:
# The reason why it should also fail in Python 3 is that the
# result of Python 3 is a complex number, which uncertainties
# does not handle (no uncertainties on complex numbers). In
# Python 2, this should always fail, since Python 2 does not
# know how to calculate it.
pass
else:
if sys.version_info >= (2, 6):
raise Exception('A proper exception should have been raised')
else:
assert test_uncertainties.isnan(result.nominal_value)
assert test_uncertainties.isnan(result.std_dev)
def test_power_wrt_ref():
'''
Checks special cases of the umath.pow() power operator.
'''
test_uncertainties.power_wrt_ref(umath.pow, math.pow)
