mesh.Mesh.compact

Mesh.compact(return_index=False)

Remove unconnected nodes and renumber the Mesh.

Returns a Mesh where all nodes that are not used in any element have been removed, and the nodes are renumbered to a compacter scheme.

If return_index is True, also returns an index specifying the index of the new nodes in the old node scheme.

Examples

>>> x = Coords([[i] for i in np.arange(5)])
>>> M = Mesh(x,[[0,2],[1,4],[4,2]])
>>> M,ind = M.compact(True)
>>> print(M.coords)
[[0. 0. 0.]
 [1. 0. 0.]
 [2. 0. 0.]
 [4. 0. 0.]]
>>> print(M.elems)
[[0 2]
 [1 3]
 [3 2]]

>>> M = Mesh(x,[[0,2],[1,3],[3,2]])
>>> M = M.compact()
>>> print(M.coords)
[[0. 0. 0.]
 [1. 0. 0.]
 [2. 0. 0.]
 [3. 0. 0.]]
>>> print(M.elems)
[[0 2]
 [1 3]
 [3 2]]
>>> print(ind)
[0 1 2 4]

>>> M = M.remove_selected([0,1,2])
>>> M.coords.shape, M.elems.shape
((4, 3), (0, 2))
>>> M = M.compact()
>>> M.coords.shape, M.elems.shape
((0, 3), (0, 2))