diff options
Diffstat (limited to 'src/Alpha_complex/include/gudhi/Alpha_complex.h')
| -rw-r--r-- | src/Alpha_complex/include/gudhi/Alpha_complex.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/Alpha_complex/include/gudhi/Alpha_complex.h b/src/Alpha_complex/include/gudhi/Alpha_complex.h index b315fa99..028ec9bb 100644 --- a/src/Alpha_complex/include/gudhi/Alpha_complex.h +++ b/src/Alpha_complex/include/gudhi/Alpha_complex.h @@ -20,6 +20,7 @@ #include <stdlib.h> #include <math.h> // isnan, fmax #include <memory> // for std::unique_ptr +#include <cstddef> // for std::size_t #include <CGAL/Delaunay_triangulation.h> #include <CGAL/Regular_triangulation.h> // aka. Weighted Delaunay triangulation @@ -213,6 +214,15 @@ class Alpha_complex { Alpha_complex (Alpha_complex&& other) = delete; Alpha_complex& operator= (Alpha_complex&& other) = delete; + /** \brief Returns the number of finite vertices in the triangulation. + */ + std::size_t num_vertices() const { + if (triangulation_ == nullptr) + return 0; + else + return triangulation_->number_of_vertices(); + } + /** \brief get_point returns the point corresponding to the vertex given as parameter. * * @param[in] vertex Vertex handle of the point to retrieve. @@ -373,7 +383,7 @@ class Alpha_complex { // -------------------------------------------------------------------------------------------- // Simplex_tree construction from loop on triangulation finite full cells list - if (triangulation_->number_of_vertices() > 0) { + if (num_vertices() > 0) { for (auto cit = triangulation_->finite_full_cells_begin(); cit != triangulation_->finite_full_cells_end(); ++cit) { @@ -435,8 +445,10 @@ class Alpha_complex { // -------------------------------------------------------------------------------------------- // -------------------------------------------------------------------------------------------- - // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension - complex.make_filtration_non_decreasing(); + if (!exact) + // As Alpha value is an approximation, we have to make filtration non decreasing while increasing the dimension + // Only in not exact version, cf. https://github.com/GUDHI/gudhi-devel/issues/57 + complex.make_filtration_non_decreasing(); // Remove all simplices that have a filtration value greater than max_alpha_square complex.prune_above_filtration(max_alpha_square); // -------------------------------------------------------------------------------------------- |