diff options
Diffstat (limited to 'src/python/include/Simplex_tree_interface.h')
-rw-r--r-- | src/python/include/Simplex_tree_interface.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/python/include/Simplex_tree_interface.h b/src/python/include/Simplex_tree_interface.h index 56d7c41d..e288a8cf 100644 --- a/src/python/include/Simplex_tree_interface.h +++ b/src/python/include/Simplex_tree_interface.h @@ -15,10 +15,13 @@ #include <gudhi/distance_functions.h> #include <gudhi/Simplex_tree.h> #include <gudhi/Points_off_io.h> +#include <gudhi/Flag_complex_edge_collapser.h> #include <iostream> #include <vector> #include <utility> // std::pair +#include <tuple> +#include <iterator> // for std::distance namespace Gudhi { @@ -157,6 +160,34 @@ class Simplex_tree_interface : public Simplex_tree<SimplexTreeOptions> { return new_dgm; } + Simplex_tree_interface* collapse_edges(int nb_collapse_iteration) { + using Filtered_edge = std::tuple<Vertex_handle, Vertex_handle, Filtration_value>; + std::vector<Filtered_edge> edges; + for (Simplex_handle sh : Base::skeleton_simplex_range(1)) { + if (Base::dimension(sh) == 1) { + typename Base::Simplex_vertex_range rg = Base::simplex_vertex_range(sh); + auto vit = rg.begin(); + Vertex_handle v = *vit; + Vertex_handle w = *++vit; + edges.emplace_back(v, w, Base::filtration(sh)); + } + } + + for (int iteration = 0; iteration < nb_collapse_iteration; iteration++) { + edges = Gudhi::collapse::flag_complex_collapse_edges(edges); + } + Simplex_tree_interface* collapsed_stree_ptr = new Simplex_tree_interface(); + // Copy the original 0-skeleton + for (Simplex_handle sh : Base::skeleton_simplex_range(0)) { + collapsed_stree_ptr->insert({*(Base::simplex_vertex_range(sh).begin())}, Base::filtration(sh)); + } + // Insert remaining edges + for (auto remaining_edge : edges) { + collapsed_stree_ptr->insert({std::get<0>(remaining_edge), std::get<1>(remaining_edge)}, std::get<2>(remaining_edge)); + } + return collapsed_stree_ptr; + } + // Iterator over the simplex tree Complex_simplex_iterator get_simplices_iterator_begin() { // this specific case works because the range is just a pair of iterators - won't work if range was a vector |