** Changed in: dolfin
Status: New => Won't Fix
** Changed in: dolfin
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/788610
Title:
PyDolfin VariationalProblem does not provide a common_cell for forms
with invalid cells
Status in DOLFIN:
Won't Fix
Bug description:
Dolfin does not always pass a common_cell to jit if there are missing
cells in the form.
Using this code:
from dolfin import *
parameters["form_compiler"]["name"] = "sfc"
mesh = UnitInterval(10)
V = FunctionSpace(mesh, "CG", 1)
v = TestFunction(V)
u = TrialFunction(V)
f = Expression("x[0]")
a = v*u*dx
L = v*f*dx
problem = VariationalProblem(a, L)
I printed arguments from sfc.jit:
common cell = None
str(form) =
{ v_{-2} * <Expression ()> } * dx0
repr(form) =
Form([Integral(Product(Argument(FiniteElement('Lagrange', Cell('interval',
Space(1)), 1, None), -2), Coefficient(FiniteElement('Lagrange', Cell(None,
None), None, None), 0)), Measure('cell', 0, None))])
Thus the form compiler must analyse the input form to detect whether PyDOLFIN
has given an ill defined form and find the common cell itself before preprocess.
The above code works with ffc, from which I infer that ffc must detect
a common cell.
Is this intended behaviour?
If it was up to me I would rip out common_cell once and for all, it
leads to a lot of clutter...
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