/usr/lib/python2.7/dist-packages/ufl/coefficient.py is in python-ufl 2017.2.0.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | # -*- coding: utf-8 -*-
"""This module defines the Coefficient class and a number
of related classes, including Constant."""
# Copyright (C) 2008-2016 Martin Sandve Alnæs
#
# This file is part of UFL.
#
# UFL is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# UFL 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with UFL. If not, see <http://www.gnu.org/licenses/>.
#
# Modified by Anders Logg, 2008-2009.
# Modified by Massimiliano Leoni, 2016.
from ufl.utils.py23 import as_native_str
from ufl.log import error
from ufl.core.ufl_type import ufl_type
from ufl.core.terminal import FormArgument
from ufl.finiteelement import FiniteElementBase, FiniteElement, VectorElement, TensorElement
from ufl.domain import as_domain, default_domain
from ufl.functionspace import AbstractFunctionSpace, FunctionSpace
from ufl.split_functions import split
from ufl.utils.counted import counted_init
# --- The Coefficient class represents a coefficient in a form ---
@ufl_type()
class Coefficient(FormArgument):
"""UFL form argument type: Representation of a form coefficient."""
# Slots are disabled here because they cause trouble in PyDOLFIN
# multiple inheritance pattern:
# __slots__ = ("_count", "_ufl_function_space", "_repr", "_ufl_shape")
_ufl_noslots_ = True
_globalcount = 0
def __init__(self, function_space, count=None):
FormArgument.__init__(self)
counted_init(self, count, Coefficient)
if isinstance(function_space, FiniteElementBase):
# For legacy support for .ufl files using cells, we map
# the cell to The Default Mesh
element = function_space
domain = default_domain(element.cell())
function_space = FunctionSpace(domain, element)
elif not isinstance(function_space, AbstractFunctionSpace):
error("Expecting a FunctionSpace or FiniteElement.")
self._ufl_function_space = function_space
self._ufl_shape = function_space.ufl_element().value_shape()
self._repr = as_native_str("Coefficient(%s, %s)" % (
repr(self._ufl_function_space), repr(self._count)))
def count(self):
return self._count
@property
def ufl_shape(self):
"Return the associated UFL shape."
return self._ufl_shape
def ufl_function_space(self):
"Get the function space of this coefficient."
return self._ufl_function_space
def ufl_domain(self):
"Shortcut to get the domain of the function space of this coefficient."
return self._ufl_function_space.ufl_domain()
def ufl_element(self):
"Shortcut to get the finite element of the function space of this coefficient."
return self._ufl_function_space.ufl_element()
def is_cellwise_constant(self):
"Return whether this expression is spatially constant over each cell."
return self.ufl_element().is_cellwise_constant()
def ufl_domains(self):
"Return tuple of domains related to this terminal object."
return self._ufl_function_space.ufl_domains()
def _ufl_signature_data_(self, renumbering):
"Signature data for form arguments depend on the global numbering of the form arguments and domains."
count = renumbering[self]
fsdata = self._ufl_function_space._ufl_signature_data_(renumbering)
return ("Coefficient", count, fsdata)
def __str__(self):
count = str(self._count)
if len(count) == 1:
return "w_%s" % count
else:
return "w_{%s}" % count
def __repr__(self):
return self._repr
def __eq__(self, other):
if not isinstance(other, Coefficient):
return False
if self is other:
return True
return (self._count == other._count and
self._ufl_function_space == other._ufl_function_space)
# --- Helper functions for defining constant coefficients without
# --- specifying element ---
def Constant(domain, count=None):
"""UFL value: Represents a globally constant scalar valued coefficient."""
domain = as_domain(domain)
element = FiniteElement("Real", domain.ufl_cell(), 0)
fs = FunctionSpace(domain, element)
return Coefficient(fs, count=count)
def VectorConstant(domain, dim=None, count=None):
"""UFL value: Represents a globally constant vector valued coefficient."""
domain = as_domain(domain)
element = VectorElement("Real", domain.ufl_cell(), 0, dim)
fs = FunctionSpace(domain, element)
return Coefficient(fs, count=count)
def TensorConstant(domain, shape=None, symmetry=None, count=None):
"""UFL value: Represents a globally constant tensor valued coefficient."""
domain = as_domain(domain)
element = TensorElement("Real", domain.ufl_cell(), 0, shape=shape,
symmetry=symmetry)
fs = FunctionSpace(domain, element)
return Coefficient(fs, count=count)
# --- Helper functions for subfunctions on mixed elements ---
def Coefficients(function_space):
"""UFL value: Create a Coefficient in a mixed space, and return a
tuple with the function components corresponding to the subelements."""
return split(Coefficient(function_space))
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