added function to read point cloud from array in memory + changed a little bit the API

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/Nerve_GIC@3841 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: f31a3a60b2438d7b767a1ee310d859477330a743

1 files changed, 26 insertions, 0 deletions

diff --git a/src/cython/include/Persistent_cohomology_interface.h b/src/cython/include/Persistent_cohomology_interface.h
index a86b1187..8cf71a4e 100644
--- a/src/cython/include/Persistent_cohomology_interface.h
+++ b/src/cython/include/Persistent_cohomology_interface.h
@@ -85,6 +85,32 @@ persistent_cohomology::Persistent_cohomology<FilteredComplex, persistent_cohomol
     return persistence;
   }
 
+  std::vector<std::pair<std::vector<int>, std::vector<int>>> persistence_pairs() {
+    auto pairs = persistent_cohomology::Persistent_cohomology<FilteredComplex,
+      persistent_cohomology::Field_Zp>::get_persistent_pairs();
+
+    std::vector<std::pair<std::vector<int>, std::vector<int>>> persistence_pairs;
+    persistence_pairs.reserve(pairs.size());
+    for (auto pair : pairs) {
+      std::vector<int> birth;
+      if (get<0>(pair) != stptr_->null_simplex()) {
+        for (auto vertex : stptr_->simplex_vertex_range(get<0>(pair))) {
+          birth.push_back(vertex);
+        }
+      }
+
+      std::vector<int> death;
+      if (get<1>(pair) != stptr_->null_simplex()) {
+        for (auto vertex : stptr_->simplex_vertex_range(get<1>(pair))) {
+          death.push_back(vertex);
+        }
+      }
+
+      persistence_pairs.push_back(std::make_pair(birth, death));
+    }
+    return persistence_pairs;
+  }
+
  private:
   // A copy
   FilteredComplex* stptr_;