dolfinx::io Namespace Reference

Support for file IO. More...

Namespaces
namespace	cells
	Functions for the re-ordering of input mesh topology to the DOLFINx ordering, and transpose orderings for file output.
namespace	xdmf_function
	Low-level methods for reading/writing XDMF files.
namespace	xdmf_mesh
	Low-level methods for reading XDMF files.

Classes
class	VTKFile
	Output of meshes and functions in VTK/ParaView format. More...
class	XDMFFile
	Read and write mesh::Mesh, fem::Function and other objects in XDMF. More...

Functions
template<typename T >
std::tuple< std::vector< T >, std::array< std::size_t, 2 >, std::vector< std::int64_t >, std::vector< std::uint8_t >, std::vector< std::int64_t >, std::array< std::size_t, 2 > >	vtk_mesh_from_space (const fem::FunctionSpace< T > &V)
	Given a FunctionSpace, create a topology and geometry based on the dof coordinates.
std::pair< std::vector< std::int64_t >, std::array< std::size_t, 2 > >	extract_vtk_connectivity (MDSPAN_IMPL_STANDARD_NAMESPACE::mdspan< const std::int32_t, MDSPAN_IMPL_STANDARD_NAMESPACE::dextents< std::size_t, 2 > > dofmap_x, mesh::CellType cell_type)
	Extract the cell topology (connectivity) in VTK ordering for all cells the mesh. The 'topology' includes higher-order 'nodes'.

Detailed Description

Support for file IO.

IO to files for checkpointing and visualisation.

Function Documentation

extract_vtk_connectivity()

std::pair< std::vector< std::int64_t >, std::array< std::size_t, 2 > > extract_vtk_connectivity	(	MDSPAN_IMPL_STANDARD_NAMESPACE::mdspan< const std::int32_t, MDSPAN_IMPL_STANDARD_NAMESPACE::dextents< std::size_t, 2 > >	dofmap_x,
		mesh::CellType	cell_type )

Extract the cell topology (connectivity) in VTK ordering for all cells the mesh. The 'topology' includes higher-order 'nodes'.

The index of a 'node' corresponds to the index of DOLFINx geometry 'nodes'.

Parameters

[in]	dofmap_x	Geometry dofmap.
[in]	cell_type	Cell type.

Returns

Cell topology in VTK ordering and in term of the DOLFINx geometry 'nodes'.

Note

The indices in the return array correspond to the point indices in the mesh geometry array.

Even if the indices are local (int32), VTX requires int64 as local input.

vtk_mesh_from_space()

template<typename T >

std::tuple< std::vector< T >, std::array< std::size_t, 2 >, std::vector< std::int64_t >, std::vector< std::uint8_t >, std::vector< std::int64_t >, std::array< std::size_t, 2 > > vtk_mesh_from_space

(

const fem::FunctionSpace< T > &

V

)

Given a FunctionSpace, create a topology and geometry based on the dof coordinates.

Precondition

V must be a (discontinuous) Lagrange space

Parameters

[in]

V

The function space

Returns

Mesh data

1. node coordinates (shape={num_nodes, 3}), row-major storage
2. node coordinates shape
3. unique global ID for each node (a node that appears on more than one rank will have the same global ID)
4. ghost index for each node (0=non-ghost, 1=ghost)
5. cells (shape={num_cells, nodes_per_cell)}), row-major storage
6. cell shape (shape={num_cells, nodes_per_cell)})