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import itertools
from pint.compat import np
from pint.converters import Converter
from pint.facets.nonmultiplicative.definitions import (
LogarithmicConverter,
OffsetConverter,
)
from pint.facets.plain import ScaleConverter
from pint.testsuite import helpers
class TestConverter:
def test_converter(self):
c = Converter()
assert c.is_multiplicative
assert not c.is_logarithmic
assert c.to_reference(8)
assert c.from_reference(8)
def test_multiplicative_converter(self):
c = ScaleConverter(20.0)
assert c.is_multiplicative
assert not c.is_logarithmic
assert c.from_reference(c.to_reference(100)) == 100
assert c.to_reference(c.from_reference(100)) == 100
def test_offset_converter(self):
c = OffsetConverter(20.0, 2)
assert not c.is_multiplicative
assert not c.is_logarithmic
assert c.from_reference(c.to_reference(100)) == 100
assert c.to_reference(c.from_reference(100)) == 100
def test_log_converter(self):
c = LogarithmicConverter(scale=1, logbase=10, logfactor=1)
assert not c.is_multiplicative
assert c.is_logarithmic
assert round(abs(c.to_reference(0) - 1), 7) == 0
assert round(abs(c.to_reference(1) - 10), 7) == 0
assert round(abs(c.to_reference(2) - 100), 7) == 0
assert round(abs(c.from_reference(1) - 0), 7) == 0
assert round(abs(c.from_reference(10) - 1), 7) == 0
assert round(abs(c.from_reference(100) - 2), 7) == 0
arb_value = 20.0
assert (
round(abs(c.from_reference(c.to_reference(arb_value)) - arb_value), 7) == 0
)
assert (
round(abs(c.to_reference(c.from_reference(arb_value)) - arb_value), 7) == 0
)
@helpers.requires_numpy
def test_converter_inplace(self):
for c in (ScaleConverter(20.0), OffsetConverter(20.0, 2)):
fun1 = lambda x, y: c.from_reference(c.to_reference(x, y), y)
fun2 = lambda x, y: c.to_reference(c.from_reference(x, y), y)
for fun, (inplace, comp) in itertools.product(
(fun1, fun2), ((True, True), (False, False))
):
a = np.ones((1, 10))
ac = np.ones((1, 10))
r = fun(a, inplace)
np.testing.assert_allclose(r, ac)
if comp:
assert a is r
else:
assert a is not r
@helpers.requires_numpy
def test_log_converter_inplace(self):
arb_value = 3.13
c = LogarithmicConverter(scale=1, logbase=10, logfactor=1)
from_to = lambda value, inplace: c.from_reference(
c.to_reference(value, inplace), inplace
)
to_from = lambda value, inplace: c.to_reference(
c.from_reference(value, inplace), inplace
)
for fun, (inplace, comp) in itertools.product(
(from_to, to_from), ((True, True), (False, False))
):
arb_array = arb_value * np.ones((1, 10))
result = fun(arb_array, inplace)
np.testing.assert_allclose(result, arb_array)
if comp:
assert arb_array is result
else:
assert arb_array is not result
def test_from_arguments(self):
assert Converter.from_arguments(scale=1) == ScaleConverter(1)
assert Converter.from_arguments(scale=2, offset=3) == OffsetConverter(2, 3)
assert Converter.from_arguments(
scale=4, logbase=5, logfactor=6
) == LogarithmicConverter(4, 5, 6)
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