1 files changed, 67 insertions, 0 deletions
diff --git a/src/Rips_complex/example/example_rips_complex_from_fvecs.cpp b/src/Rips_complex/example/example_rips_complex_from_fvecs.cpp
new file mode 100644
index 00000000..c05d038a
--- /dev/null
+++ b/src/Rips_complex/example/example_rips_complex_from_fvecs.cpp
@@ -0,0 +1,67 @@
+#include <gudhi/Rips_complex.h>
+// to construct Rips_complex from a fvecs file of points
+#include <gudhi/Simplex_tree.h>
+#include <gudhi/Fake_simplex_tree.h>
+#include <gudhi/distance_functions.h>
+#include <gudhi/Points_fvecs_reader.h>
+
+#include <CGAL/Epick_d.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+void usage(int nbArgs, char * const progName) {
+  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
+  std::cerr << "Usage: " << progName << " filename.fvecs threshold dim_max [ouput_file.txt]\n";
+  std::cerr << "       i.e.: " << progName << " ../../data/points/alphacomplexdoc.fvecs 60.0\n";
+  exit(-1);  // ----- >>
+}
+
+int main(int argc, char **argv) {
+  if ((argc != 4) && (argc != 5)) usage(argc, (argv[0] - 1));
+
+  std::string file_name(argv[1]);
+  double threshold = atof(argv[2]);
+  int dim_max = atoi(argv[3]);
+
+  // Type definitions
+  using K = CGAL::Epick_d<CGAL::Dynamic_dimension_tag>;
+  using Point = typename K::Point_d;
+  //using Simplex_tree = Gudhi::Simplex_tree<>;
+  using Simplex_tree = Gudhi::Fake_simplex_tree;
+  using Filtration_value = Simplex_tree::Filtration_value;
+  using Rips_complex = Gudhi::rips_complex::Rips_complex<Filtration_value>;
+  using Point_vector = std::vector<Point>;
+
+  // ----------------------------------------------------------------------------
+  // Init of a Rips complex from an fvecs file
+  // ----------------------------------------------------------------------------
+  Point_vector point_vector;
+  Gudhi::load_points_from_fvecs_file<K>(file_name, std::back_insert_iterator< Point_vector >(point_vector));
+
+  Rips_complex rips_complex_from_file(point_vector, threshold, Gudhi::Euclidean_distance());
+
+  std::streambuf* streambufffer;
+  std::ofstream ouput_file_stream;
+
+  if (argc == 5) {
+    ouput_file_stream.open(std::string(argv[4]));
+    streambufffer = ouput_file_stream.rdbuf();
+  } else {
+    streambufffer = std::cout.rdbuf();
+  }
+
+  Simplex_tree stree;
+  rips_complex_from_file.create_complex(stree, dim_max);
+  std::ostream output_stream(streambufffer);
+
+  // ----------------------------------------------------------------------------
+  // Display information about the Rips complex
+  // ----------------------------------------------------------------------------
+  output_stream << "Rips complex is of dimension " << stree.dimension() <<
+                   " - " << stree.num_simplices() << " simplices." << std::endl;
+
+  ouput_file_stream.close();
+  return 0;
+}