/usr/lib/python2.7/dist-packages/ufl/coefficient.py is in python-ufl 1.6.0-1.
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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 | """This module defines the Coefficient class and a number
of related classes, including Constant."""
# Copyright (C) 2008-2014 Martin Sandve Alnes
#
# 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.
from ufl.log import warning
from ufl.assertions import ufl_assert
from ufl.core.terminal import Terminal, FormArgument
from ufl.finiteelement import FiniteElementBase, FiniteElement, VectorElement, TensorElement
from ufl.split_functions import split
from ufl.common import counted_init
from ufl.core.ufl_type import ufl_type
# --- 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", "_element", "_repr", "_gradient", "_derivatives")
_ufl_noslots_ = True
_globalcount = 0
def __init__(self, element, count=None):
FormArgument.__init__(self)
counted_init(self, count, Coefficient)
ufl_assert(isinstance(element, FiniteElementBase),
"Expecting a FiniteElementBase instance.")
self._element = element
self._repr = None
def count(self):
return self._count
def reconstruct(self, element=None, count=None):
# This code is shared with the FooConstant classes
if element is None or element == self._element:
element = self._element
if count is None or count == self._count:
count = self._count
if count is self._count and element is self._element:
return self
ufl_assert(isinstance(element, FiniteElementBase),
"Expecting an element, not %s" % element)
ufl_assert(isinstance(count, int),
"Expecting an int, not %s" % count)
ufl_assert(element.value_shape() == self._element.value_shape(),
"Cannot reconstruct a Coefficient with a different value shape.")
return self._reconstruct(element, count)
def _reconstruct(self, element, count):
# This code is class specific
return Coefficient(element, count)
def element(self):
return self._element
@property
def ufl_shape(self):
return self._element.value_shape()
def is_cellwise_constant(self):
"Return whether this expression is spatially constant over each cell."
return self._element.is_cellwise_constant()
def domains(self):
"Return tuple of domains related to this terminal object."
return self._element.domains()
def signature_data(self, renumbering):
"Signature data for form arguments depend on the global numbering of the form arguments and domains."
count = renumbering[self]
edata = self.element().signature_data(renumbering)
d = self.domain()
ddata = None if d is None else d.signature_data(renumbering)
return ("Coefficient", count, edata, ddata)
def __str__(self):
count = str(self._count)
if len(count) == 1:
return "w_%s" % count
else:
return "w_{%s}" % count
def __repr__(self):
if self._repr is None:
self._repr = "Coefficient(%r, %r)" % (self._element, self._count)
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._element == other._element)
# --- Helper functions for defining constant coefficients without specifying element ---
def Constant(domain, count=None):
"""UFL value: Represents a globally constant scalar valued coefficient."""
e = FiniteElement("Real", domain, 0)
return Coefficient(e, count=count)
def VectorConstant(domain, dim=None, count=None):
"""UFL value: Represents a globally constant vector valued coefficient."""
e = VectorElement("Real", domain, 0, dim)
return Coefficient(e, count=count)
def TensorConstant(domain, shape=None, symmetry=None, count=None):
"""UFL value: Represents a globally constant tensor valued coefficient."""
e = TensorElement("Real", domain, 0, shape=shape, symmetry=symmetry)
return Coefficient(e, count=count)
# --- Helper functions for subfunctions on mixed elements ---
def Coefficients(element):
"""UFL value: Create a Coefficient in a mixed space, and return a
tuple with the function components corresponding to the subelements."""
return split(Coefficient(element))
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