/usr/share/pyshared/dolfin/fem/bcs.py is in python-dolfin 1.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | # Copyright (C) 2009-2011 Anders Logg
#
# This file is part of DOLFIN.
#
# DOLFIN 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.
#
# DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2008-10-22
# Last changed: 2011-11-15
__all__ = ["AutoSubDomain", "DirichletBC", "PeriodicBC", "homogenize"]
import types
import dolfin.cpp as cpp
from dolfin.functions.constant import Constant
from dolfin.compilemodules.subdomains import compile_subdomains
import ufl
from dolfin.fem.projection import project
class AutoSubDomain(cpp.SubDomain):
"Wrapper class for creating a SubDomain from an inside() function."
def __init__(self, inside_function):
"Create SubDomain subclass for given inside() function"
# Check that we get a function
if not isinstance(inside_function, types.FunctionType):
cpp.dolfin_error("bcs.py",
"auto-create subdomain",
"Expecting a function (not %s)" % \
str(type(inside_function)))
self.inside_function = inside_function
# Check the number of arguments
if not inside_function.func_code.co_argcount in (1, 2):
cpp.dolfin_error("bcs.py",
"auto-create subdomain",
"Expecting a function of the form inside(x) or inside(x, on_boundary)")
self.num_args = inside_function.func_code.co_argcount
cpp.SubDomain.__init__(self)
def inside(self, x, on_boundary):
"Return true for points inside the subdomain"
if self.num_args == 1:
return self.inside_function(x)
else:
return self.inside_function(x, on_boundary)
class DirichletBC(cpp.DirichletBC):
# Reuse doc-string from cpp.DirichletBC
__doc__ = cpp.DirichletBC.__doc__
def __init__(self, *args, **kwargs):
"Create Dirichlet boundary condition"
# Special case for value specified as float, tuple or similar
if len(args) >= 2 and not isinstance(args[1], cpp.GenericFunction):
if isinstance(args[1], ufl.classes.Expr):
expr = project(args[1], args[0])
else:
expr = Constant(args[1]) # let Constant handle all problems
args = args[:1] + (expr,) + args[2:]
# Special case for sub domain specified as a function
if len(args) >= 3 and isinstance(args[2], types.FunctionType):
sub_domain = AutoSubDomain(args[2])
args = args[:2] + (sub_domain,) + args[3:]
# Special case for sub domain specified as a string
if len(args) >= 3 and isinstance(args[2], str):
sub_domain = compile_subdomains(args[2])
args = args[:2] + (sub_domain,) + args[3:]
# Store Expression to avoid scoping issue with SWIG directors
if isinstance(args[1], cpp.Expression):
self.function_arg = args[1]
# Store SubDomain to avoid scoping issue with SWIG directors
self.domain_args = args[2:]
# Add method argument if it's given
if "method" in kwargs:
args = tuple(list(args) + [kwargs["method"]])
# Initialize base class
cpp.DirichletBC.__init__(self, *args)
# Set doc string
__init__.__doc__ = cpp.DirichletBC.__init__.__doc__
# No fancy handling of PeriodicBC since it requires two different callbacks
PeriodicBC = cpp.PeriodicBC
def homogenize(bc):
"""
Return a homogeneous version of the given boundary condition.
*Arguments*
bc
a :py:class:`DirichletBC <dolfin.fem.bcs.DirichletBC>` instance,
or a list/tuple of
:py:class:`DirichletBC <dolfin.fem.bcs.DirichletBC>` instances.
Other types of boundary conditions, like periodic, are ignored.
If the given boundary condition is a list of boundary conditions,
then a list of homogeneous boundary conditions is returned.
"""
# Handle case when boundary condition is a list
if isinstance(bc, (list, tuple)):
bcs = bc
return [homogenize(bc) for bc in bcs]
# Only consider Dirichlet boundary conditions
if not isinstance(bc, cpp.DirichletBC):
return bc
# Create zero function
V = bc.function_space()
if V.element().value_rank() == 0:
zero = Constant(0)
elif V.element().value_rank() == 1:
zero = Constant([0]*V.element().value_dimension(0))
else:
cpp.dolfin_error("bcs.py",
"homogenize boundary condition",
"Unhandled value rank %d for homogenization of boundary conditions" % \
V.element().value_rank())
# Create homogeneous boundary condition
if len(bc.domain_args) == 1:
new_bc = cpp.DirichletBC(V, zero, bc.domain_args[0])
elif len(bc.domain_args) == 2:
new_bc = cpp.DirichletBC(V, zero, bc.domain_args[0], bc.domain_args[1])
else:
cpp.dolfin_error("bcs.py",
"homogenize boundary condition",
"Unknown type of boundary specification")
new_bc.domain_args = bc.domain_args
return new_bc
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