New question #135590 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/135590
what might be the reason of this exception at
...dist-packages/ufl/algorithms/formtransformations.py
line 45
def expr(self, x):
"The default is a nonlinear operator not accepting any basis functions
in its children."
# TODO: Other operators to implement particularly? Will see when errors
here trigger...
if any(isinstance(t, Argument) for t in traverse_terminals(x)):
error("Found basis function in %s, this is an invalid expression."
% repr(x))
while trying to construct this tensor-linear dirichlet poisson problem:
def sigma(v):
d = 0.5*(grad(v)+grad(v).T)
d2 = 0.5*inner(d,d)
mu = atan(sqrt(d2)/b)
return (2.0*mu*d)
w = TestFunction(V)
v = TrialFunction(V)
a = inner(sigma(v),grad(w))*dx
L = 0.0
problem = VariationalProblem(a, L, bcs=bc)
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