/usr/lib/python2.7/dist-packages/dolfin/fem/interpolation.py is in python-dolfin 1.3.0+dfsg-2.
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 | """This module provides a simple way to compute the interpolation of a
:py:class:`Function <dolfin.functions.function.Function>` or
:py:class:`Expression <dolfin.functions.expression.Expression>` onto a
finite element space."""
# 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: 2009-08-29
# Last changed: 2011-11-15
__all__ = ["interpolate"]
# Local imports
import dolfin.cpp as cpp
from dolfin.functions.functionspace import FunctionSpaceBase
from dolfin.functions.function import Function
def interpolate(v, V):
"""
Return interpolation of a given function into a given finite element space.
*Arguments*
v
a :py:class:`Function <dolfin.functions.function.Function>` or
an :py:class:`Expression <dolfin.functions.expression.Expression>`
V
a :py:class:`FunctionSpace (standard, mixed, etc.)
<dolfin.functions.functionspace.FunctionSpaceBase>`
*Example of usage*
.. code-block:: python
v = Expression("sin(pi*x[0])")
V = FunctionSpace(mesh, "Lagrange", 1)
Iv = interpolate(v, V)
"""
# Check arguments
if not isinstance(V, FunctionSpaceBase):
cpp.dolfin_error("interpolation.py",
"compute interpolation",
"Illegal function space for interpolation, not a FunctionSpace (%s)" % str(v))
# Compute interpolation
Pv = Function(V)
Pv.interpolate(v)
return Pv
|