def evaluate_ignoring_errors(self):
"""
Evaluates the expression. If a node exists in the tree that cannot be evaluated
as a scalar or vector (e.g. Parameter, Variable, StateVector, InputParameter),
then None is returned. Otherwise the result of the evaluation is given
See Also
--------
evaluate : evaluate the expression
"""
try:
result = self.evaluate(t=0, u="shape test")
except NotImplementedError:
# return None if NotImplementedError is raised
# (there is a e.g. Parameter, Variable, ... in the tree)
return None
except TypeError as error:
# return None if specific TypeError is raised
# (there is a e.g. StateVector in the tree)
if error.args[0] == "StateVector cannot evaluate input 'y=None'":
return None
else:
raise error
except ValueError as e:
raise pybamm.ShapeError(
"Cannot find shape (original error: {})".format(e))
return result
def concatenation(self, disc_children):
"""Discrete concatenation, taking `edge_to_node` for children that evaluate on
edges.
See :meth:`pybamm.SpatialMethod.concatenation`
"""
for idx, child in enumerate(disc_children):
n_nodes = sum(
len(mesh.nodes) for mesh in self.mesh.combine_submeshes(*child.domain)
)
n_edges = sum(
len(mesh.edges) for mesh in self.mesh.combine_submeshes(*child.domain)
)
child_size = child.size
if child_size != n_nodes:
# Average any children that evaluate on the edges (size n_edges) to
# evaluate on nodes instead, so that concatenation works properly
if child_size == n_edges:
disc_children[idx] = self.edge_to_node(child)
else:
raise pybamm.ShapeError(
"""
child must have size n_nodes (number of nodes in the mesh)
or n_edges (number of edges in the mesh)
"""
)
return pybamm.DomainConcatenation(disc_children, self.mesh)
def test_shape(self):
"""
Check that the discretised self has a pybamm `shape`, i.e. can be evaluated
Raises
------
pybamm.ShapeError
If the shape of the object cannot be found
"""
try:
self.shape_for_testing
except ValueError as e:
raise pybamm.ShapeError("Cannot find shape (original error: {})".format(e))