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def create_edges(self):
"""Set up edge-node and edge-cell relations.
"""
# Reshape into individual edges.
# Sort the columns to make it possible for `unique()` to identify
# individual edges.
s = self.idx_hierarchy.shape
a = numpy.sort(self.idx_hierarchy.reshape(s[0], -1).T)
a_unique, inv, cts = unique_rows(a)
assert numpy.all(
cts < 3
), "No edge has more than 2 cells. Are cells listed twice?"
self.is_boundary_edge = (cts[inv] == 1).reshape(s[1:])
self.is_boundary_edge_individual = cts == 1
self.edges = {"nodes": a_unique}
# cell->edges relationship
self.cells["edges"] = inv.reshape(3, -1).T
self._edges_cells = None
self._edge_gid_to_edge_list = None