def test_implicit_convert_xor(self):
x = Symbol('x')
self.assertEqual(parse_expr("3x^2/5", local_dict={}),
x**2*sympify("3/5"))
self.assertEqual(
normalize_floats(parse_expr("3x^2/5.", local_dict={})),
normalize_floats(0.6*x**2))
def eval_to_comparison_precision(self, expression, additional_rounding=None, evaluate=None):
"""
If parameter round_on_compare is set,
evaluate all numbers and numbersymbols (like pi)
of expression to floats
with either round_on_compare digits of precision (if not round_absolute)
or to round_on_compare decimals (if round_absolute)
It will convert floats to integers if round_absolute and
round_on_compare <= 0.
If additional rounding is set, round_on_compare is reduced by
that amount.
If round_on_compare is not set,
then normalize all floats to 14 digits of precision
to increase consistency of floats in presence of roundoff errors.
"""
modified = False
round_on_compare = self._parameters.get("round_on_compare")
if round_on_compare is not None:
if additional_rounding:
try:
round_on_compare -= int(additional_rounding)
except ValueError:
pass
round_absolute = self._parameters.get("round_absolute", False)
if round_absolute:
expression = round_expression(expression, round_on_compare, evaluate=evaluate)
modified = True
elif round_on_compare > 0:
expression = evalf_expression(expression, round_on_compare, evaluate=evaluate)
modified = True
if not modified:
expression = normalize_floats(expression, evaluate=evaluate)
return expression
def test_rationals_floats(self):
x = Symbol('x')
self.assertEqual(parse_expr("3x^2/5"), x**2*sympify("3/5"))
self.assertEqual(
normalize_floats(parse_expr("3x^2/5.")),
normalize_floats(0.6*x**2))