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test_units.py
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test_units.py
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# -*- coding: utf-8 -*-
"""
Test symbolic unit handling.
"""
# -----------------------------------------------------------------------------
# Copyright (c) 2018, yt Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the LICENSE file, distributed with this software.
# -----------------------------------------------------------------------------
import numpy as np
from numpy.testing import (
assert_almost_equal,
assert_allclose,
assert_array_almost_equal_nulp,
assert_equal,
)
import operator
import pickle
import pytest
from sympy import Symbol
from unyt.testing import assert_allclose_units
from unyt.unit_registry import UnitRegistry
from unyt.dimensions import (
mass,
length,
time,
temperature,
energy,
magnetic_field_cgs,
magnetic_field_mks,
power,
rate,
)
from unyt.exceptions import InvalidUnitOperation, UnitsNotReducible, UnitConversionError
from unyt.unit_object import default_unit_registry, Unit, UnitParseError
from unyt.unit_systems import cgs_unit_system, UnitSystem
from unyt._unit_lookup_table import (
default_unit_symbol_lut,
name_alternatives,
unit_prefixes,
)
import unyt.unit_symbols as unit_symbols
from unyt._physical_ratios import (
m_per_pc,
sec_per_year,
m_per_km,
m_per_mpc,
mass_sun_kg,
)
def test_no_conflicting_symbols():
"""
Check unit symbol definitions for conflicts.
"""
full_set = set(default_unit_symbol_lut.keys())
# go through all possible prefix combos
for symbol in default_unit_symbol_lut.keys():
if default_unit_symbol_lut[symbol][4]:
keys = unit_prefixes.keys()
else:
keys = [symbol]
for prefix in keys:
new_symbol = "%s%s" % (prefix, symbol)
# test if we have seen this symbol
assert new_symbol not in full_set, "Duplicate symbol: %s" % new_symbol
full_set.add(new_symbol)
def test_dimensionless():
"""
Create dimensionless unit and check attributes.
"""
u1 = Unit()
assert u1.is_dimensionless
assert u1.expr == 1
assert u1.base_value == 1
assert u1.dimensions == 1
assert u1 != "hello!"
assert (u1 == "hello") is False
u2 = Unit("")
assert u2.is_dimensionless
assert u2.expr == 1
assert u2.base_value == 1
assert u2.dimensions == 1
assert_equal(u1.latex_repr, "")
assert_equal(u2.latex_repr, "")
def test_create_from_string():
"""
Create units with strings and check attributes.
"""
u1 = Unit("kg * m**2 * s**-2")
assert u1.dimensions == energy
assert u1.base_value == 1.0
# make sure order doesn't matter
u2 = Unit("m**2 * s**-2 * kg")
assert u2.dimensions == energy
assert u2.base_value == 1.0
# Test rationals
u3 = Unit("kg**0.5 * m**-0.5 * s**-1")
assert u3.dimensions == magnetic_field_cgs
assert u3.base_value == 1.0
# sqrt functions
u4 = Unit("sqrt(kg)/sqrt(m)/s")
assert u4.dimensions == magnetic_field_cgs
assert u4.base_value == 1.0
# commutative sqrt function
u5 = Unit("sqrt(kg/m)/s")
assert u5.dimensions == magnetic_field_cgs
assert u5.base_value == 1.0
# nonzero CGS conversion factor
u6 = Unit("Msun/pc**3")
assert u6.dimensions == mass / length ** 3
assert_array_almost_equal_nulp(
np.array([u6.base_value]), np.array([mass_sun_kg / m_per_pc ** 3])
)
with pytest.raises(UnitParseError):
Unit("m**m")
with pytest.raises(UnitParseError):
Unit("m**g")
with pytest.raises(UnitParseError):
Unit("m+g")
with pytest.raises(UnitParseError):
Unit("m-g")
with pytest.raises(UnitParseError):
Unit("hello!")
with pytest.raises(UnitParseError):
Unit("True")
with pytest.raises(UnitParseError):
Unit("else")
with pytest.raises(UnitParseError):
Unit("hello(37)")
with pytest.raises(UnitParseError):
Unit("hello(foo=37)")
cm = Unit("cm")
data = 1 * cm
assert Unit(data) == cm
assert Unit(b"cm") == cm
def test_create_from_expr():
"""
Create units from sympy Exprs and check attributes.
"""
pc_mks = m_per_pc
yr_mks = sec_per_year
# Symbol expr
s1 = Symbol("pc", positive=True)
s2 = Symbol("yr", positive=True)
# Mul expr
s3 = s1 * s2
# Pow expr
s4 = s1 ** 2 * s2 ** (-1)
u1 = Unit(s1)
u2 = Unit(s2)
u3 = Unit(s3)
u4 = Unit(s4)
assert u1.expr == s1
assert u2.expr == s2
assert u3.expr == s3
assert u4.expr == s4
assert_allclose_units(u1.base_value, pc_mks, 1e-12)
assert_allclose_units(u2.base_value, yr_mks, 1e-12)
assert_allclose_units(u3.base_value, pc_mks * yr_mks, 1e-12)
assert_allclose_units(u4.base_value, pc_mks ** 2 / yr_mks, 1e-12)
assert u1.dimensions == length
assert u2.dimensions == time
assert u3.dimensions == length * time
assert u4.dimensions == length ** 2 / time
def test_create_with_duplicate_dimensions():
"""
Create units with overlapping dimensions. Ex: km/Mpc.
"""
u1 = Unit("J * s**-1")
u2 = Unit("km/s/Mpc")
km_mks = m_per_km
Mpc_mks = m_per_mpc
assert u1.base_value == 1
assert u1.dimensions == power
assert_allclose_units(u2.base_value, km_mks / Mpc_mks, 1e-12)
assert u2.dimensions == rate
def test_create_new_symbol():
"""
Create unit with unknown symbol.
"""
u1 = Unit("abc", base_value=42, dimensions=(mass / time))
assert u1.expr == Symbol("abc", positive=True)
assert u1.base_value == 42
assert u1.dimensions == mass / time
u1 = Unit("abc", base_value=42, dimensions=length ** 3)
assert u1.expr == Symbol("abc", positive=True)
assert u1.base_value == 42
assert u1.dimensions == length ** 3
u1 = Unit("abc", base_value=42, dimensions=length * (mass * length))
assert u1.expr == Symbol("abc", positive=True)
assert u1.base_value == 42
assert u1.dimensions == length ** 2 * mass
with pytest.raises(UnitParseError):
Unit("abc", base_value=42, dimensions=length ** length)
with pytest.raises(UnitParseError):
Unit("abc", base_value=42, dimensions=length ** (length * length))
with pytest.raises(UnitParseError):
Unit("abc", base_value=42, dimensions=length - mass)
with pytest.raises(UnitParseError):
Unit("abc", base_value=42, dimensions=length + mass)
def test_create_fail_on_unknown_symbol():
"""
Fail to create unit with unknown symbol, without base_value and dimensions.
"""
with pytest.raises(UnitParseError):
Unit(Symbol("jigawatts"))
def test_create_fail_on_bad_symbol_type():
"""
Fail to create unit with bad symbol type.
"""
with pytest.raises(UnitParseError):
Unit([1]) # something other than Expr and str
def test_create_fail_on_bad_dimensions_type():
"""
Fail to create unit with bad dimensions type.
"""
with pytest.raises(UnitParseError):
Unit("a", base_value=1, dimensions="(mass)")
def test_create_fail_on_dimensions_content():
"""
Fail to create unit with bad dimensions expr.
"""
a = Symbol("a")
with pytest.raises(UnitParseError):
Unit("a", base_value=1, dimensions=a)
def test_create_fail_on_base_value_type():
"""
Fail to create unit with bad base_value type.
"""
with pytest.raises(UnitParseError):
Unit("a", base_value="a", dimensions=(mass / time))
def test_string_representation():
"""
Check unit string representation.
"""
pc = Unit("pc")
Myr = Unit("Myr")
speed = pc / Myr
dimensionless = Unit()
assert str(pc) == "pc"
assert str(Myr) == "Myr"
assert str(speed) == "pc/Myr"
assert repr(speed) == "pc/Myr"
assert str(dimensionless) == "dimensionless"
assert repr(dimensionless) == "(dimensionless)"
def test_multiplication():
"""
Multiply two units.
"""
msun_mks = mass_sun_kg
pc_mks = m_per_pc
# Create symbols
msun_sym = Symbol("Msun", positive=True)
pc_sym = Symbol("pc", positive=True)
s_sym = Symbol("s", positive=True)
# Create units
u1 = Unit("Msun")
u2 = Unit("pc")
# Mul operation
u3 = u1 * u2
assert u3.expr == msun_sym * pc_sym
assert_allclose_units(u3.base_value, msun_mks * pc_mks, 1e-12)
assert u3.dimensions == mass * length
# Pow and Mul operations
u4 = Unit("pc**2")
u5 = Unit("Msun * s")
u6 = u4 * u5
assert u6.expr == pc_sym ** 2 * msun_sym * s_sym
assert_allclose_units(u6.base_value, pc_mks ** 2 * msun_mks, 1e-12)
assert u6.dimensions == length ** 2 * mass * time
def test_division():
"""
Divide two units.
"""
pc_mks = m_per_pc
km_mks = m_per_km
# Create symbols
pc_sym = Symbol("pc", positive=True)
km_sym = Symbol("km", positive=True)
s_sym = Symbol("s", positive=True)
# Create units
u1 = Unit("pc")
u2 = Unit("km * s")
u3 = u1 / u2
assert u3.expr == pc_sym / (km_sym * s_sym)
assert_allclose_units(u3.base_value, pc_mks / km_mks, 1e-12)
assert u3.dimensions == 1 / time
def test_power():
"""
Take units to some power.
"""
from sympy import nsimplify
pc_mks = m_per_pc
mK_mks = 1e-3
u1_dims = mass * length ** 2 * time ** -3 * temperature ** 4
u1 = Unit("kg * pc**2 * s**-3 * mK**4")
u2 = u1 ** 2
assert u2.dimensions == u1_dims ** 2
assert_allclose_units(u2.base_value, (pc_mks ** 2 * mK_mks ** 4) ** 2, 1e-12)
u3 = u1 ** (-1.0 / 3)
assert u3.dimensions == nsimplify(u1_dims ** (-1.0 / 3))
assert_allclose_units(
u3.base_value, (pc_mks ** 2 * mK_mks ** 4) ** (-1.0 / 3), 1e-12
)
def test_equality():
"""
Check unit equality with different symbols, but same dimensions and
base_value.
"""
u1 = Unit("km * s**-1")
u2 = Unit("m * ms**-1")
assert u1 == u2
assert u1.copy() == u2
def test_invalid_operations():
u1 = Unit("cm")
u2 = Unit("m")
with pytest.raises(InvalidUnitOperation):
u1 + u2
with pytest.raises(InvalidUnitOperation):
u1 += u2
with pytest.raises(InvalidUnitOperation):
1 + u1
with pytest.raises(InvalidUnitOperation):
u1 + 1
with pytest.raises(InvalidUnitOperation):
u1 - u2
with pytest.raises(InvalidUnitOperation):
u1 -= u2
with pytest.raises(InvalidUnitOperation):
1 - u1
with pytest.raises(InvalidUnitOperation):
u1 - 1
with pytest.raises(InvalidUnitOperation):
u1 *= u2
with pytest.raises(InvalidUnitOperation):
u1 * "hello!"
with pytest.raises(InvalidUnitOperation):
u1 /= u2
with pytest.raises(InvalidUnitOperation):
u1 / "hello!"
with pytest.raises(InvalidUnitOperation):
Unit("B") * Unit("V")
with pytest.raises(InvalidUnitOperation):
Unit("V") * Unit("B")
with pytest.raises(InvalidUnitOperation):
Unit("V") / Unit("Np")
with pytest.raises(InvalidUnitOperation):
Unit("dB") / Unit("dB")
with pytest.raises(InvalidUnitOperation):
Unit("B") ** 2
def test_base_equivalent():
"""
Check base equivalent of a unit.
"""
Msun_mks = mass_sun_kg
Mpc_mks = m_per_mpc
u1 = Unit("Msun * Mpc**-3")
u2 = Unit("kg * m**-3")
u3 = u1.get_base_equivalent()
assert u2.expr == u3.expr
assert u2 == u3
assert_allclose_units(u1.base_value, Msun_mks / Mpc_mks ** 3, 1e-12)
assert u2.base_value == 1
assert u3.base_value == 1
mass_density = mass / length ** 3
assert u1.dimensions == mass_density
assert u2.dimensions == mass_density
assert u3.dimensions == mass_density
assert_allclose_units(
u1.get_conversion_factor(u3)[0], Msun_mks / Mpc_mks ** 3, 1e-12
)
with pytest.raises(UnitConversionError):
u1.get_conversion_factor(Unit("m"))
with pytest.raises(UnitConversionError):
u1.get_conversion_factor(Unit("degF"))
reg = UnitRegistry(unit_system=cgs_unit_system)
u = Unit("kg", registry=reg)
assert u.get_base_equivalent() == Unit("g")
u = Unit("kg")
assert u.get_base_equivalent() == Unit("kg")
u = Unit("A")
assert u.get_base_equivalent(unit_system="mks") == Unit("A")
def test_temperature_offsets():
u1 = Unit("degC")
u2 = Unit("degF")
with pytest.raises(InvalidUnitOperation):
operator.mul(u1, u2)
with pytest.raises(InvalidUnitOperation):
operator.truediv(u1, u2)
def test_latex_repr():
registry = UnitRegistry()
# create a fake comoving unit
registry.add(
"pccm",
registry.lut["pc"][0] / (1 + 2),
length,
"\\rm{pc}/(1+z)",
prefixable=True,
)
test_unit = Unit("Mpccm", registry=registry)
assert_almost_equal(test_unit.base_value, m_per_mpc / 3)
assert_equal(test_unit.latex_repr, r"\rm{Mpc}/(1+z)")
test_unit = Unit("cm**-3", base_value=1.0, registry=registry)
assert_equal(test_unit.latex_repr, "\\frac{1}{\\rm{cm}^{3}}")
test_unit = Unit("m_geom/l_geom**3")
assert_equal(test_unit.latex_repr, "\\frac{1}{\\rm{M}_\\odot^{2}}")
test_unit = Unit("1e9*cm")
assert_equal(test_unit.latex_repr, "1.0 \\times 10^{9}\\ \\rm{cm}")
test_unit = Unit("1.0*cm")
assert_equal(test_unit.latex_repr, "\\rm{cm}")
def test_latitude_longitude():
lat = unit_symbols.lat
lon = unit_symbols.lon
deg = unit_symbols.deg
assert_equal(lat.units.base_offset, 90.0)
assert_equal((deg * 90.0).in_units("lat").value, 0.0)
assert_equal((deg * 180).in_units("lat").value, -90.0)
assert_equal((lat * 0.0).in_units("deg"), deg * 90.0)
assert_equal((lat * -90).in_units("deg"), deg * 180)
assert_equal(lon.units.base_offset, -180.0)
assert_equal((deg * 0.0).in_units("lon").value, -180.0)
assert_equal((deg * 90.0).in_units("lon").value, -90.0)
assert_equal((deg * 180).in_units("lon").value, 0.0)
assert_equal((deg * 360).in_units("lon").value, 180.0)
assert_equal((lon * -180.0).in_units("deg"), deg * 0.0)
assert_equal((lon * -90.0).in_units("deg"), deg * 90.0)
assert_equal((lon * 0.0).in_units("deg"), deg * 180.0)
assert_equal((lon * 180.0).in_units("deg"), deg * 360)
def test_creation_from_ytarray():
from unyt import electrostatic_unit, elementary_charge_cgs
u1 = Unit(electrostatic_unit)
assert_equal(str(u1), "statC")
assert_equal(u1, Unit("esu"))
assert_equal(u1, electrostatic_unit.units)
u2 = Unit(elementary_charge_cgs)
assert_equal(str(u2), "4.80320467299766e-10*statC")
assert_equal(u2, Unit("4.80320467299766e-10*statC"))
assert_equal(u1, elementary_charge_cgs.units)
assert_allclose((u1 / u2).base_value, electrostatic_unit / elementary_charge_cgs)
with pytest.raises(UnitParseError):
Unit([1, 2, 3] * elementary_charge_cgs)
def test_list_same_dimensions():
from unyt import m
reg = default_unit_registry
for equiv in reg.list_same_dimensions(m):
assert Unit(equiv).dimensions is length
def test_decagram():
dag = Unit("dag")
g = Unit("g")
assert dag.get_conversion_factor(g) == (10.0, None)
def test_pickle():
cm = Unit("cm")
assert cm == pickle.loads(pickle.dumps(cm))
def test_preserve_offset():
from unyt import degF, dimensionless
new_unit = degF * dimensionless
assert new_unit is not degF
assert new_unit == degF
assert new_unit.base_offset == degF.base_offset
new_unit = degF / dimensionless
assert new_unit is not degF
assert new_unit == degF
assert new_unit.base_offset == degF.base_offset
with pytest.raises(InvalidUnitOperation):
dimensionless / degF
def test_code_unit():
from unyt import UnitRegistry
ureg = UnitRegistry()
ureg.add("code_length", 10.0, length)
ureg.add("code_magnetic_field", 2.0, magnetic_field_mks)
u = Unit("code_length", registry=ureg)
assert u.is_code_unit is True
assert u.get_base_equivalent() == Unit("m")
u = Unit("cm")
assert u.is_code_unit is False
u = Unit("code_magnetic_field", registry=ureg)
assert u.get_base_equivalent("mks") == Unit("T")
with pytest.raises(UnitsNotReducible):
assert u.get_base_equivalent("cgs")
# see issue #60
u = Unit("s/m")
assert u.get_mks_equivalent() == Unit("s/m")
assert u.get_mks_equivalent() != Unit("ohm")
assert u.get_cgs_equivalent() == Unit("s/cm")
u = Unit("kC")
assert u.get_cgs_equivalent() == Unit("kesu")
assert u.get_cgs_equivalent().get_mks_equivalent() == u
UnitSystem(ureg.unit_system_id, "code_length", "kg", "s", registry=ureg)
u = Unit("cm", registry=ureg)
ue = u.get_base_equivalent("code")
assert str(ue) == "code_length"
assert ue.base_value == 10
assert ue.dimensions is length
class FakeDataset(object):
unit_registry = ureg
ds = FakeDataset()
UnitSystem(ds, "code_length", "kg", "s", registry=ureg)
u = Unit("cm", registry=ureg)
ue = u.get_base_equivalent(ds)
assert str(ue) == "code_length"
assert ue.base_value == 10
assert ue.dimensions is length
with pytest.raises(UnitParseError):
Unit("code_length")
def test_bad_equivalence():
from unyt import cm
with pytest.raises(KeyError):
cm.has_equivalent("dne")
def test_em_unit_base_equivalent():
from unyt import A, cm
with pytest.raises(UnitsNotReducible):
(A / cm).get_base_equivalent("cgs")
def test_symbol_lut_length():
for v in default_unit_symbol_lut.values():
assert len(v) == 5
def test_simplify():
import unyt as u
answers = {
u.Hz * u.s: "dimensionless",
u.kg / u.g: "1000",
u.Hz * u.s * u.km: "km",
u.kHz * u.s: "1000",
u.kHz * u.s * u.km: "1000*km",
u.kHz * u.s ** 2: "1000*s",
u.kHz * u.s ** 2 * u.km: "1000*km*s",
u.Hz ** -1 * u.s: "s/Hz",
u.Hz ** -1 * u.s * u.km: "km*s/Hz",
u.Hz ** 1.5 * u.s ** 1.7: "sqrt(Hz)*s**(7/10)",
u.Hz ** 1.5 * u.s ** 1.7 * u.km: "sqrt(Hz)*km*s**(7/10)",
u.m ** 2 / u.cm ** 2: "10000",
}
for unit, answer in answers.items():
assert str(unit.simplify()) == answer
def test_micro_prefix():
import unyt as u
# both versions of unicode mu work correctly
assert u.um == u.µm
assert u.um == u.μm
# parsing both versions works as well
assert u.ug == u.Unit("µg")
assert u.ug == u.Unit("μg")
def test_name_alternatives():
import unyt
from unyt._unit_lookup_table import (
default_unit_name_alternatives,
name_alternatives,
inv_name_alternatives,
)
# concatenated list of all alternative unit names
allowed_names = sum(name_alternatives.values(), [])
# ensure the values are all tuples and not e.g. strings
for val in default_unit_name_alternatives.values():
assert isinstance(val, tuple)
# all names are unique
assert len(set(allowed_names)) == len(allowed_names)
# each allowed name has a key in the inverse dict
assert len(inv_name_alternatives.keys()) == len(allowed_names)
assert set(inv_name_alternatives.keys()) == set(allowed_names)
for name in allowed_names:
assert hasattr(unyt, name)
assert hasattr(unyt.unit_symbols, name)
def test_attosecond():
from unyt import Unit, attosecond, second
assert Unit("as") == attosecond
assert str(Unit("as")) == "as"
assert Unit("as/s") == attosecond / second
def test_micro():
from unyt import Unit
assert str(Unit("um")) == "µm"
assert str(Unit("us")) == "µs"
def test_show_all_units_doc_table_ops():
for name in set(name_alternatives.keys()):
u = Unit(name)
(1 * u).in_mks()
try:
(1 * u).in_cgs()
except UnitsNotReducible:
pass
def test_hPa_mbar():
assert Unit("hPa").dimensions == Unit("bar").dimensions
assert (5 * Unit("hPa") == 5 * Unit("mbar")).all()
assert (5 * Unit("hPa") != 1 * Unit("bar")).all()
def test_percent():
a = 300 * Unit("percent")
b = 3.0 * Unit("dimensionless")
c = 300.0 * Unit("%")
d = 300.0 * Unit("V*%/V")
assert a == b
assert str(a) == "300 %"
assert repr(a) == "unyt_quantity(300, '%')"
assert a == c
assert c == d
def test_equal_has_same_hash():
a = Unit("m")
b = Unit("m")
c = Unit("m*s/s")
assert a == b
assert b == c
assert hash(a) == hash(b)
assert hash(b) == hash(c)
def test_bel_neper():
assert Unit("B").dimensions == Unit("Np").dimensions
a = 1 * Unit("B") / (np.log(10) / 2)
assert_allclose_units(a.to("Np"), 1 * Unit("Np"))
a = 2 * Unit("B")
b = 20 * Unit("decibel")
assert (a == b).all()
c = 2 * Unit("Np")
d = 20 * Unit("decineper")
assert (c == d).all()
assert Unit("dB") ** 1 == Unit("dB")
def test_henry():
assert (Unit("H") / Unit("Ω")).dimensions == time