# Source code for netket.hilbert.continuous_hilbert

```# Copyright 2021 The NetKet Authors - All rights reserved.
#
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#
# Unless required by applicable law or agreed to in writing, software
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
from typing import Union

from .abstract_hilbert import AbstractHilbert

import numpy as np

[docs]
class ContinuousHilbert(AbstractHilbert):
"""Abstract class for the Hilbert space of particles
in continuous space.

This class defines the common interface that
can be used to interact with particles defined
in continuous space.
"""

[docs]
def __init__(self, domain: tuple[float, ...], pbc: Union[bool, tuple[bool, ...]]):
"""
Constructs new ``Particles`` given specifications of the continuous
space they are defined in.

This object returns an Hilber space.

Args:
domain: Tuple indicating the maximum of the continuous quantum number(s) in the configurations. Each entry
in the tuple corresponds to a different physical dimension.
If np.inf is used an infinite box is considered and `pbc=False` is mandatory (because what are PBC
if there are no boundaries?). If a finite value is given, a minimum value of zero is assumed for the
quantum number(s).
A particle in a 3D box of size L would take `(L,L,L)`. A rotor model would take e.g. `(2pi,)`.
pbc: Tuple or bool indicating whether to use periodic boundary conditions in a given physical dimension.
If tuple it must have the same length as domain. If bool the same value is used for all the dimensions
defined in domain.
"""
self._extent = tuple(domain)
self._pbc = tuple(pbc)
if not len(self._extent) == len(self._pbc):
raise ValueError(
"""`pbc` must be either a bool or a tuple indicating the periodicity of each spatial dimension."""
)

if np.any(np.logical_and(np.isinf(self._extent), pbc)):
raise ValueError(
"If you do have periodic boundary conditions in a given direction the maximum of the quantum number "
"in that direction must be finite."
)

super().__init__()

@property
def extent(self) -> tuple[float, ...]:
r"""Spatial extension in each spatial dimension"""
return self._extent

@property
def pbc(self) -> tuple[bool, ...]:
r"""Whether or not to use periodic boundary conditions for each spatial dimension"""
return self._pbc

```