multi_field.py 4.3 KB
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright(C) 2013-2018 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

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from ..field import Field
import numpy as np
from .multi_domain import MultiDomain


class MultiField(object):
    def __init__(self, val):
        """
        Parameters
        ----------
        val : dict
        """
        self._val = val

    def __getitem__(self, key):
        return self._val[key]

    def keys(self):
        return self._val.keys()

    def items(self):
        return self._val.items()

    def values(self):
        return self._val.values()

    @property
    def domain(self):
        return MultiDomain({key: val.domain for key, val in self._val.items()})

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    @property
    def dtype(self):
        return {key: val.dtype for key, val in self._val.items()}

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    @staticmethod
    def from_random(random_type, domain, dtype=np.float64, **kwargs):
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        dtype = MultiField.build_dtype(dtype, domain)
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        return MultiField({key: Field.from_random(random_type, domain[key],
                                                  dtype[key], **kwargs)
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                           for key in domain.keys()})
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    def _check_domain(self, other):
        if other.domain != self.domain:
            raise ValueError("domains are incompatible.")

    def vdot(self, x):
        result = 0.
        self._check_domain(x)
        for key, sub_field in self.items():
            result += sub_field.vdot(x[key])
        return result

    def lock(self):
        for v in self.values():
            v.lock()
        return self

    def copy(self):
        return MultiField({key: val.copy() for key, val in self.items()})

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    @staticmethod
    def build_dtype(dtype, domain):
        if isinstance(dtype, dict):
            return dtype
        if dtype is None:
            dtype = np.float64
        return {key: dtype for key in domain.keys()}

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    @staticmethod
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    def empty(domain, dtype=None):
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        dtype = MultiField.build_dtype(dtype, domain)
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        return MultiField({key: Field.empty(dom, dtype=dtype[key])
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                           for key, dom in domain.items()})
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    @staticmethod
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    def full(domain, val):
        return MultiField({key: Field.full(dom, val)
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                           for key, dom in domain.items()})
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    def norm(self):
        """ Computes the L2-norm of the field values.

        Returns
        -------
        norm : float
            The L2-norm of the field values.
        """
        return np.sqrt(np.abs(self.vdot(x=self)))

    def __neg__(self):
        return MultiField({key: -val for key, val in self.items()})

    def conjugate(self):
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        return MultiField({key: sub_field.conjugate()
                           for key, sub_field in self.items()})
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for op in ["__add__", "__radd__", "__iadd__",
           "__sub__", "__rsub__", "__isub__",
           "__mul__", "__rmul__", "__imul__",
           "__div__", "__rdiv__", "__idiv__",
           "__truediv__", "__rtruediv__", "__itruediv__",
           "__floordiv__", "__rfloordiv__", "__ifloordiv__",
           "__pow__", "__rpow__", "__ipow__",
           "__lt__", "__le__", "__gt__", "__ge__", "__eq__", "__ne__"]:
    def func(op):
        def func2(self, other):
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            if isinstance(other, MultiField):
                self._check_domain(other)
                result_val = {key: getattr(sub_field, op)(other[key])
                              for key, sub_field in self.items()}
            else:
                result_val = {key: getattr(val, op)(other)
                              for key, val in self.items()}
            return MultiField(result_val)
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        return func2
    setattr(MultiField, op, func(op))