Method clone

python/dolfinx/fem/function.py:742–770

Create a FunctionSpace which shares data with this space. The new space has a different unique integer ID. Create a new FunctionSpace :math:`W` which shares data with this FunctionSpace :math:`V`, but with a different unique integer ID. This function is helpful for

(self)

        super().__init__(ufl_domain, element)

    def clone(self) -> FunctionSpace[Real]:
        """Create a FunctionSpace which shares data with this space.

        The new space has a different unique integer ID.

        Create a new FunctionSpace :math:`W` which shares data with this
        FunctionSpace :math:`V`, but with a different unique integer ID.

        This function is helpful for defining mixed problems and using
        blocked linear algebra. For example, a matrix block defined on
        the spaces :math:`V \\times W` where, :math:`V` and :math:`W`
        are defined on the same finite element and mesh can be
        identified as an off-diagonal block whereas the :math:`V \\times
        V` and :math:`V \\times V` matrices can be identified as
        diagonal blocks. This is relevant for the handling of boundary
        conditions.

        Returns:
            A new function space that shares data
        """  # noqa: D301
        try:
            Vcpp = _cpp.fem.FunctionSpace_float64(
                self._cpp_object.mesh, self._cpp_object.element, self._cpp_object.dofmap
            )  # type: ignore
        except TypeError:
            Vcpp = _cpp.fem.FunctionSpace_float32(
                self._cpp_object.mesh, self._cpp_object.element, self._cpp_object.dofmap
            )  # type: ignore
        return FunctionSpace(self._mesh, self.ufl_element(), Vcpp)

    @property
    def num_sub_spaces(self) -> int: