/usr/share/pyshared/quantities/dimensionality.py is in python-quantities 0.10.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
"""
from __future__ import absolute_import
import sys
import operator
import numpy as np
from . import markup
from .registry import unit_registry
from .decorators import memoize
def assert_isinstance(obj, types):
try:
assert isinstance(obj, types)
except AssertionError:
raise TypeError(
"arg %r must be of type %r, got %r" % (obj, types, type(obj))
)
class Dimensionality(dict):
"""
"""
@property
def ndims(self):
return sum(abs(i) for i in self.simplified.values())
@property
def simplified(self):
if len(self):
rq = 1*unit_registry['dimensionless']
for u, d in self.items():
rq = rq * u.simplified**d
return rq.dimensionality
else:
return self
@property
def string(self):
return markup.format_units(self)
@property
def unicode(self):
return markup.format_units_unicode(self)
@property
def latex(self):
return markup.format_units_latex(self)
def __hash__(self):
res = hash(unit_registry['dimensionless'])
for key in sorted(self.keys(), key=operator.attrgetter('format_order')):
val = self[key]
if val < 0:
# can you believe that hash(-1)==hash(-2)?
val -= 1
res ^= hash((key, val))
return res
def __add__(self, other):
assert_isinstance(other, Dimensionality)
try:
assert self == other
except AssertionError:
raise ValueError(
'can not add units of %s and %s'\
%(str(self), str(other))
)
return self.copy()
__radd__ = __add__
def __iadd__(self, other):
assert_isinstance(other, Dimensionality)
try:
assert self == other
except AssertionError:
raise ValueError(
'can not add units of %s and %s'\
%(str(self), str(other))
)
return self
def __sub__(self, other):
assert_isinstance(other, Dimensionality)
try:
assert self == other
except AssertionError:
raise ValueError(
'can not subtract units of %s and %s'\
%(str(self), str(other))
)
return self.copy()
__rsub__ = __sub__
def __isub__(self, other):
assert_isinstance(other, Dimensionality)
try:
assert self == other
except AssertionError:
raise ValueError(
'can not add units of %s and %s'\
%(str(self), str(other))
)
return self
def __mul__(self, other):
assert_isinstance(other, Dimensionality)
new = Dimensionality(self)
for unit, power in other.items():
try:
new[unit] += power
if new[unit] == 0:
new.pop(unit)
except KeyError:
new[unit] = power
return new
def __imul__(self, other):
assert_isinstance(other, Dimensionality)
for unit, power in other.items():
try:
self[unit] += power
if self[unit] == 0:
self.pop(unit)
except KeyError:
self[unit] = power
return self
def __truediv__(self, other):
assert_isinstance(other, Dimensionality)
new = Dimensionality(self)
for unit, power in other.items():
try:
new[unit] -= power
if new[unit] == 0:
new.pop(unit)
except KeyError:
new[unit] = -power
return new
if sys.version_info[0] < 3:
def __div__(self, other):
assert_isinstance(other, Dimensionality)
return self.__truediv__(other)
def __itruediv__(self, other):
assert_isinstance(other, Dimensionality)
for unit, power in other.items():
try:
self[unit] -= power
if self[unit] == 0:
self.pop(unit)
except KeyError:
self[unit] = -power
return self
if sys.version_info[0] < 3:
def __idiv__(self, other):
assert_isinstance(other, Dimensionality)
return self.__itruediv__(other)
def __pow__(self, other):
try:
assert np.isscalar(other)
except AssertionError:
raise TypeError('exponent must be a scalar, got %r' % other)
if other == 0:
return Dimensionality()
new = Dimensionality(self)
for i in new:
new[i] *= other
return new
def __ipow__(self, other):
try:
assert np.isscalar(other)
except AssertionError:
raise TypeError('exponent must be a scalar, got %r' % other)
if other == 0:
self.clear()
return self
for i in self:
self[i] *= other
return self
def __repr__(self):
return 'Dimensionality({%s})' \
% ', '.join(['%s: %s'% (u.name, e) for u, e in self.items()])
def __str__(self):
if markup.config.use_unicode:
return self.unicode
else:
return self.string
def __eq__(self, other):
return hash(self) == hash(other)
def __ne__(self, other):
return hash(self) != hash(other)
__neq__ = __ne__
def __gt__(self, other):
return self.ndims > other.ndims
def __ge__(self, other):
return self.ndims >= other.ndims
def __lt__(self, other):
return self.ndims < other.ndims
def __le__(self, other):
return self.ndims <= other.ndims
def copy(self):
return Dimensionality(self)
p_dict = {}
def _d_multiply(q1, q2, out=None):
try:
return q1._dimensionality * q2._dimensionality
except AttributeError:
try:
return q1.dimensionality
except:
return q2.dimensionality
p_dict[np.multiply] = _d_multiply
p_dict[np.cross] = _d_multiply
def _d_divide(q1, q2, out=None):
try:
return q1._dimensionality / q2._dimensionality
except AttributeError:
try:
return q1.dimensionality
except:
return q2.dimensionality**-1
p_dict[np.divide] = _d_divide
p_dict[np.true_divide] = _d_divide
def _d_check_uniform(q1, q2, out=None):
try:
assert q1._dimensionality == q2._dimensionality
return q1.dimensionality
except AssertionError:
raise ValueError(
'quantities must have identical units, got "%s" and "%s"' %
(q1.units, q2.units)
)
except AttributeError:
try:
if hasattr(q1, 'dimensionality'):
# q2 was not a quantity
if not q1._dimensionality or not np.asarray(q2).any():
return q1.dimensionality
else:
raise ValueError
elif hasattr(q2, 'dimensionality'):
# q1 was not a quantity
if not q2._dimensionality or not np.asarray(q1).any():
return q2.dimensionality
else:
raise ValueError
except ValueError:
raise ValueError(
'quantities must have identical units, got "%s" and "%s"' %
(q1.units, q2.units)
)
p_dict[np.add] = _d_check_uniform
p_dict[np.subtract] = _d_check_uniform
p_dict[np.mod] = _d_check_uniform
p_dict[np.fmod] = _d_check_uniform
p_dict[np.remainder] = _d_check_uniform
p_dict[np.floor_divide] = _d_check_uniform
p_dict[np.arctan2] = _d_check_uniform
p_dict[np.hypot] = _d_check_uniform
def _d_power(q1, q2, out=None):
if getattr(q2, 'dimensionality', None):
raise ValueError("exponent must be dimensionless")
try:
q2 = np.array(q2)
p = q2.min()
if p != q2.max():
raise ValueError('Quantities must be raised to a uniform power')
return q1._dimensionality**p
except AttributeError:
return Dimensionality()
p_dict[np.power] = _d_power
def _d_square(q1, out=None):
return q1._dimensionality**2
p_dict[np.square] = _d_square
def _d_reciprocal(q1, out=None):
return q1._dimensionality**-1
p_dict[np.reciprocal] = _d_reciprocal
def _d_copy(q1, out=None):
return q1.dimensionality
p_dict[np.absolute] = _d_copy
p_dict[np.conjugate] = _d_copy
p_dict[np.negative] = _d_copy
p_dict[np.ones_like] = _d_copy
p_dict[np.rint] = _d_copy
p_dict[np.floor] = _d_copy
p_dict[np.fix] = _d_copy
p_dict[np.ceil] = _d_copy
def _d_sqrt(q1, out=None):
return q1._dimensionality**0.5
p_dict[np.sqrt] = _d_sqrt
def _d_radians(q1, out=None):
try:
assert q1.units == unit_registry['degree']
except AssertionError:
raise ValueError(
'expected units of degrees, got "%s"' % q1._dimensionality
)
return unit_registry['radian'].dimensionality
p_dict[np.radians] = _d_radians
def _d_degrees(q1, out=None):
try:
assert q1.units == unit_registry['radian']
except AssertionError:
raise ValueError(
'expected units of radians, got "%s"' % q1._dimensionality
)
return unit_registry['degree'].dimensionality
p_dict[np.degrees] = _d_degrees
def _d_dimensionless(q1, out=None):
if getattr(q1, 'dimensionality', None):
raise ValueError("quantity must be dimensionless")
return Dimensionality()
p_dict[np.log] = _d_dimensionless
p_dict[np.log10] = _d_dimensionless
p_dict[np.log2] = _d_dimensionless
p_dict[np.log1p] = _d_dimensionless
p_dict[np.exp] = _d_dimensionless
p_dict[np.expm1] = _d_dimensionless
p_dict[np.logaddexp] = _d_dimensionless
p_dict[np.logaddexp2] = _d_dimensionless
def _d_trig(q1, out=None):
try:
assert q1.units == unit_registry['radian']
except AssertionError:
raise ValueError(
'expected units of radians, got "%s"' % q1._dimensionality
)
return Dimensionality()
p_dict[np.sin] = _d_trig
p_dict[np.sinh] = _d_trig
p_dict[np.cos] = _d_trig
p_dict[np.cosh] = _d_trig
p_dict[np.tan] = _d_trig
p_dict[np.tanh] = _d_trig
def _d_arctrig(q1, out=None):
if getattr(q1, 'dimensionality', None):
raise ValueError("quantity must be dimensionless")
return unit_registry['radian'].dimensionality
p_dict[np.arcsin] = _d_arctrig
p_dict[np.arcsinh] = _d_arctrig
p_dict[np.arccos] = _d_arctrig
p_dict[np.arccosh] = _d_arctrig
p_dict[np.arctan] = _d_arctrig
p_dict[np.arctanh] = _d_arctrig
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