Add example.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/sparserips-glisse@3195 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: b8ded704563c6794c098f9b80b1a5e0200e84694

1 files changed, 38 insertions, 0 deletions

diff --git a/src/Rips_complex/example/example_sparse_rips.cpp b/src/Rips_complex/example/example_sparse_rips.cpp
new file mode 100644
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--- /dev/null
+++ b/src/Rips_complex/example/example_sparse_rips.cpp
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+#include <gudhi/Sparse_rips_complex.h>
+#include <gudhi/Simplex_tree.h>
+#include <gudhi/distance_functions.h>
+
+#include <iostream>
+#include <vector>
+
+int main() {
+  using Point = std::vector<double>;
+  using Simplex_tree = Gudhi::Simplex_tree<Gudhi::Simplex_tree_options_fast_persistence>;
+  using Filtration_value = Simplex_tree::Filtration_value;
+  using Complex = Gudhi::rips_complex::Sparse_rips_complex<Filtration_value>;
+
+  Point points[] = {
+    {1.0, 1.0},
+    {7.0, 0.0},
+    {4.0, 6.0},
+    {9.0, 6.0},
+    {0.0, 14.0},
+    {2.0, 19.0},
+    {9.0, 17.0}};
+
+  // ----------------------------------------------------------------------------
+  // Init from Euclidean points
+  // ----------------------------------------------------------------------------
+  double epsilon = 2; // very rough, no guarantees
+  Complex cpx(points, Gudhi::Euclidean_distance(), epsilon);
+
+  Simplex_tree stree;
+  cpx.create_complex(stree, 10);
+
+  // ----------------------------------------------------------------------------
+  // Display information about the complex
+  // ----------------------------------------------------------------------------
+  std::cout << "Sparse Rips complex is of dimension " << stree.dimension() <<
+               " - " << stree.num_simplices() << " simplices - " <<
+               stree.num_vertices() << " vertices." << std::endl;
+}