Hi,
I seem to have a problem with "manually" applying boundary
conditions to the system of linear equations. In particular,
I get the following error
Traceback (most recent call last):
File "testbc.py", line 38, in ?
bc.apply(A, b, a)
File
"/home/meg/src/dolfin/dolfin/local/lib/python2.4/site-packages/dolfin/dolfin.py",
line 5742, in apply
return _dolfin.DirichletBC_apply(*args)
NotImplementedError: Wrong number of arguments for
overloaded
function 'DirichletBC_apply'.
Possible C/C++ prototypes are:
apply(dolfin::GenericMatrix &,dolfin::GenericVector
&,dolfin::Form const &)
apply(dolfin::GenericMatrix &,dolfin::GenericVector
&,ufc::form
const &)
apply(dolfin::GenericMatrix &,dolfin::GenericVector
&,dolfin::GenericVector const &,dolfin::Form const &)
apply(dolfin::GenericMatrix &,dolfin::GenericVector
&,dolfin::GenericVector const &,ufc::form const &)
with the following code
from dolfin import *
class Zero(Function):
def __init__(self, element, mesh):
Function.__init__(self, element, mesh)
def eval(self, values, x):
values[0] = 0.0
class DirichletBoundary(SubDomain):
def inside(self, x, on_boundary):
return bool(on_boundary)
def Mass(element, f):
v = TestFunction(element)
u = TrialFunction(element)
a = v*u*dx
L = v*f*dx
return [a, L]
# The element space
element = FiniteElement("Lagrange", "triangle", 1)
# The mesh, boundary and boundary conditions
mesh = UnitSquare(2,2)
boundary = DirichletBoundary()
zero = Zero(element, mesh)
bc = DirichletBC(zero, mesh, boundary)
# Construct and assemble the forms
[a, L] = Mass(element, zero)
A = assemble(a, mesh)
b = assemble(L, mesh)
# Try applying boundary conditions:
bc.apply(A, b, a)
Am I missing something obvious here?
In addition, if I try just using
zero = Function(mesh, 0.0)
in the above, I get the following error from ffc. However, I
guess that I could just have a look at that when I find some
time myself...
Traceback (most recent call last):
File "testbc.py", line 33, in ?
[a, L] = Mass(element, zero)
File "testbc.py", line 18, in Mass
L = v*f*dx
File
"/home/meg/src/ffc/ffc_current/src/ffc/compiler/language/algebra.py",
line 77, in __mul__
return Form(self) * other
File
"/home/meg/src/ffc/ffc_current/src/ffc/compiler/language/algebra.py",
line 631, in __mul__
w.monomials = [p*other for p in self.monomials]
File
"/home/meg/src/ffc/ffc_current/src/ffc/compiler/language/algebra.py",
line 446, in __mul__
w1 = Monomial(other)
File
"/home/meg/src/ffc/ffc_current/src/ffc/compiler/language/algebra.py",
line 405, in __init__
self.coefficients = [Coefficient(other, index)]
File
"/home/meg/src/ffc/ffc_current/src/ffc/compiler/language/tokens.py",
line 53, in __init__
self.n0 = Index(function.n0)
File
"/home/meg/src/dolfin/dolfin/local/lib/python2.4/site-packages/dolfin/dolfin.py",
line 2733, in <lambda>
__getattr__ = lambda self, name: _swig_getattr(self,
cpp_Function, name)
File
"/home/meg/src/dolfin/dolfin/local/lib/python2.4/site-packages/dolfin/dolfin.py",
line 34, in _swig_getattr
raise AttributeError,name
AttributeError: n0
Thanks!
--
Marie E. Rognes
Ph.D Fellow,
Centre of Mathematics for Applications,
University of Oslo
http://folk.uio.no/meg
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