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import itertools
from pint.compat import np
from pint.converters import (
Converter,
LogarithmicConverter,
OffsetConverter,
ScaleConverter,
)
from pint.testsuite import BaseTestCase, helpers
class TestConverter(BaseTestCase):
def test_converter(self):
c = Converter()
self.assertTrue(c.is_multiplicative)
self.assertFalse(c.is_logarithmic)
self.assertTrue(c.to_reference(8))
self.assertTrue(c.from_reference(8))
def test_multiplicative_converter(self):
c = ScaleConverter(20.0)
self.assertTrue(c.is_multiplicative)
self.assertFalse(c.is_logarithmic)
self.assertEqual(c.from_reference(c.to_reference(100)), 100)
self.assertEqual(c.to_reference(c.from_reference(100)), 100)
def test_offset_converter(self):
c = OffsetConverter(20.0, 2)
self.assertFalse(c.is_multiplicative)
self.assertFalse(c.is_logarithmic)
self.assertEqual(c.from_reference(c.to_reference(100)), 100)
self.assertEqual(c.to_reference(c.from_reference(100)), 100)
def test_log_converter(self):
c = LogarithmicConverter(scale=1, logbase=10, logfactor=1)
self.assertFalse(c.is_multiplicative)
self.assertTrue(c.is_logarithmic)
self.assertAlmostEqual(c.to_reference(0), 1)
self.assertAlmostEqual(c.to_reference(1), 10)
self.assertAlmostEqual(c.to_reference(2), 100)
self.assertAlmostEqual(c.from_reference(1), 0)
self.assertAlmostEqual(c.from_reference(10), 1)
self.assertAlmostEqual(c.from_reference(100), 2)
arb_value = 20.0
self.assertAlmostEqual(c.from_reference(c.to_reference(arb_value)), arb_value)
self.assertAlmostEqual(c.to_reference(c.from_reference(arb_value)), arb_value)
@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, self.assertIs), (False, self.assertIsNot))
):
a = np.ones((1, 10))
ac = np.ones((1, 10))
r = fun(a, inplace)
np.testing.assert_allclose(r, ac)
comp(a, r)
@helpers.requires_numpy()
def test_log_converter_inplace(self):
arb_value = 3.14
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, self.assertIs), (False, self.assertIsNot))
):
arb_array = arb_value * np.ones((1, 10))
result = fun(arb_array, inplace)
np.testing.assert_allclose(result, arb_array)
comp(arb_array, result)
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