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"""
pint.facets.numpy.quantity
~~~~~~~~~~~~~~~~~~~~~~~~~~
:copyright: 2022 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import annotations
import functools
import math
import warnings
from typing import Any
from ..plain import PlainQuantity
from ..._typing import Shape, _MagnitudeType
from ...compat import _to_magnitude, np
from ...errors import DimensionalityError, PintTypeError, UnitStrippedWarning
from .numpy_func import (
HANDLED_UFUNCS,
copy_units_output_ufuncs,
get_op_output_unit,
matching_input_copy_units_output_ufuncs,
matching_input_set_units_output_ufuncs,
numpy_wrap,
op_units_output_ufuncs,
set_units_ufuncs,
)
def method_wraps(numpy_func):
if isinstance(numpy_func, str):
numpy_func = getattr(np, numpy_func, None)
def wrapper(func):
func.__wrapped__ = numpy_func
return func
return wrapper
class NumpyQuantity(PlainQuantity):
""" """
# NumPy function/ufunc support
__array_priority__ = 17
def __array_ufunc__(self, ufunc, method, *inputs, **kwargs):
if method != "__call__":
# Only handle ufuncs as callables
return NotImplemented
# Replicate types from __array_function__
types = {
type(arg)
for arg in list(inputs) + list(kwargs.values())
if hasattr(arg, "__array_ufunc__")
}
return numpy_wrap("ufunc", ufunc, inputs, kwargs, types)
def __array_function__(self, func, types, args, kwargs):
return numpy_wrap("function", func, args, kwargs, types)
_wrapped_numpy_methods = ["flatten", "astype", "item"]
def _numpy_method_wrap(self, func, *args, **kwargs):
"""Convenience method to wrap on the fly NumPy ndarray methods taking
care of the units.
"""
# Set input units if needed
if func.__name__ in set_units_ufuncs:
self.__ito_if_needed(set_units_ufuncs[func.__name__][0])
value = func(*args, **kwargs)
# Set output units as needed
if func.__name__ in (
matching_input_copy_units_output_ufuncs
+ copy_units_output_ufuncs
+ self._wrapped_numpy_methods
):
output_unit = self._units
elif func.__name__ in set_units_ufuncs:
output_unit = set_units_ufuncs[func.__name__][1]
elif func.__name__ in matching_input_set_units_output_ufuncs:
output_unit = matching_input_set_units_output_ufuncs[func.__name__]
elif func.__name__ in op_units_output_ufuncs:
output_unit = get_op_output_unit(
op_units_output_ufuncs[func.__name__],
self.units,
list(args) + list(kwargs.values()),
self._magnitude.size,
)
else:
output_unit = None
if output_unit is not None:
return self.__class__(value, output_unit)
return value
def __array__(self, t=None) -> np.ndarray:
warnings.warn(
"The unit of the quantity is stripped when downcasting to ndarray.",
UnitStrippedWarning,
stacklevel=2,
)
return _to_magnitude(self._magnitude, force_ndarray=True)
def clip(self, min=None, max=None, out=None, **kwargs):
if min is not None:
if isinstance(min, self.__class__):
min = min.to(self).magnitude
elif self.dimensionless:
pass
else:
raise DimensionalityError("dimensionless", self._units)
if max is not None:
if isinstance(max, self.__class__):
max = max.to(self).magnitude
elif self.dimensionless:
pass
else:
raise DimensionalityError("dimensionless", self._units)
return self.__class__(self.magnitude.clip(min, max, out, **kwargs), self._units)
def fill(self: NumpyQuantity[np.ndarray], value) -> None:
self._units = value._units
return self.magnitude.fill(value.magnitude)
def put(self: NumpyQuantity[np.ndarray], indices, values, mode="raise") -> None:
if isinstance(values, self.__class__):
values = values.to(self).magnitude
elif self.dimensionless:
values = self.__class__(values, "").to(self)
else:
raise DimensionalityError("dimensionless", self._units)
self.magnitude.put(indices, values, mode)
@property
def real(self) -> NumpyQuantity[_MagnitudeType]:
return self.__class__(self._magnitude.real, self._units)
@property
def imag(self) -> NumpyQuantity[_MagnitudeType]:
return self.__class__(self._magnitude.imag, self._units)
@property
def T(self):
return self.__class__(self._magnitude.T, self._units)
@property
def flat(self):
for v in self._magnitude.flat:
yield self.__class__(v, self._units)
@property
def shape(self) -> Shape:
return self._magnitude.shape
@shape.setter
def shape(self, value):
self._magnitude.shape = value
def searchsorted(self, v, side="left", sorter=None):
if isinstance(v, self.__class__):
v = v.to(self).magnitude
elif self.dimensionless:
v = self.__class__(v, "").to(self)
else:
raise DimensionalityError("dimensionless", self._units)
return self.magnitude.searchsorted(v, side)
def dot(self, b):
"""Dot product of two arrays.
Wraps np.dot().
"""
return np.dot(self, b)
@method_wraps("prod")
def prod(self, *args, **kwargs):
"""Return the product of quantity elements over a given axis
Wraps np.prod().
"""
return np.prod(self, *args, **kwargs)
def __ito_if_needed(self, to_units):
if self.unitless and to_units == "radian":
return
self.ito(to_units)
def __len__(self) -> int:
return len(self._magnitude)
def __getattr__(self, item) -> Any:
if item.startswith("__array_"):
# Handle array protocol attributes other than `__array__`
raise AttributeError(f"Array protocol attribute {item} not available.")
elif item in HANDLED_UFUNCS or item in self._wrapped_numpy_methods:
magnitude_as_duck_array = _to_magnitude(
self._magnitude, force_ndarray_like=True
)
try:
attr = getattr(magnitude_as_duck_array, item)
return functools.partial(self._numpy_method_wrap, attr)
except AttributeError:
raise AttributeError(
f"NumPy method {item} not available on {type(magnitude_as_duck_array)}"
)
except TypeError as exc:
if "not callable" in str(exc):
raise AttributeError(
f"NumPy method {item} not callable on {type(magnitude_as_duck_array)}"
)
else:
raise exc
try:
return getattr(self._magnitude, item)
except AttributeError:
raise AttributeError(
"Neither Quantity object nor its magnitude ({}) "
"has attribute '{}'".format(self._magnitude, item)
)
def __getitem__(self, key):
try:
return type(self)(self._magnitude[key], self._units)
except PintTypeError:
raise
except TypeError:
raise TypeError(
"Neither Quantity object nor its magnitude ({})"
"supports indexing".format(self._magnitude)
)
def __setitem__(self, key, value):
try:
# If we're dealing with a masked single value or a nan, set it
if (
isinstance(self._magnitude, np.ma.MaskedArray)
and np.ma.is_masked(value)
and getattr(value, "size", 0) == 1
) or math.isnan(value):
self._magnitude[key] = value
return
except TypeError:
pass
try:
if isinstance(value, self.__class__):
factor = self.__class__(
value.magnitude, value._units / self._units
).to_root_units()
else:
factor = self.__class__(value, self._units ** (-1)).to_root_units()
if isinstance(factor, self.__class__):
if not factor.dimensionless:
raise DimensionalityError(
value,
self.units,
extra_msg=". Assign a quantity with the same dimensionality "
"or access the magnitude directly as "
f"`obj.magnitude[{key}] = {value}`.",
)
self._magnitude[key] = factor.magnitude
else:
self._magnitude[key] = factor
except PintTypeError:
raise
except TypeError as exc:
raise TypeError(
f"Neither Quantity object nor its magnitude ({self._magnitude}) "
"supports indexing"
) from exc
|