** Changed in: dolfin
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/785192
Title:
Taking the gradient of an expression with a Constant crashes
Status in DOLFIN:
Fix Committed
Bug description:
Since a Constant does not have any way to provide a cell, PyDOLFIN
forces me to use python floats instead as coefficients in some forms,
thereby significantly increasing the amount of recompilation I have to
do. PyDOLFIN therefore does not support the full range of expressions
possible to express in UFL. This can be remedied by adding an optional
cell or mesh argument to Constant.__init__ in PyDOLFIN. Mesh is
probably more convenient/consistent in a PyDOLFIN setting.
# This currently crashes:
from dolfin import Constant, grad
grad(Constant(1e-1))
# This syntax would make it possible to express fully ufl compliant constant
coefficients in PyDOLFIN
from dolfin import Constant, grad, UnitSquare
mesh = UnitSquare(3,3)
grad(Constant(1e-1, mesh))
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