1 files changed, 62 insertions, 0 deletions
diff --git a/src/Nerve_GIC/example/MapperDelta.cpp b/src/Nerve_GIC/example/MapperDelta.cpp
new file mode 100644
index 00000000..1f8f1582
--- /dev/null
+++ b/src/Nerve_GIC/example/MapperDelta.cpp
@@ -0,0 +1,62 @@
+#include <gudhi/GIC.h>
+
+void usage(int nbArgs, char * const progName) {
+  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
+  std::cerr << "Usage: " << progName << " filename.off coordinate \n";
+  std::cerr << "       i.e.: " << progName << " ../../data/points/human.off 2 --v \n";
+  exit(-1);  // ----- >>
+}
+
+int main(int argc, char **argv) {
+  if ((argc != 6) && (argc != 7)) usage(argc, (argv[0] - 1));
+
+  std::string off_file_name(argv[1]);
+  int coord = atoi(argv[2]);
+  bool verb = 0; if(argc == 4)  verb = 1;
+
+  // Type definitions
+  using Graph_t = boost::adjacency_list < boost::vecS, boost::vecS, boost::undirectedS,\
+                                          boost::property < vertex_filtration_t, Filtration_value >,\
+                                          boost::property < edge_filtration_t, Filtration_value > >;
+
+  // ---------------------------------------
+  // Init of a Mapper Delta from an OFF file
+  // ---------------------------------------
+
+  Gudhi::graph_induced_complex::Graph_induced_complex GIC;
+  GIC.set_verbose(verb);
+
+  GIC.set_graph_from_automatic_rips(off_file_name);
+  GIC.set_function_from_coordinate(coord, off_file_name);
+  GIC.set_color_from_coordinate(coord, off_file_name);
+  GIC.set_automatic_resolution_for_GICMAP();
+  GIC.set_gain();
+  GIC.set_cover_from_function(1);
+  GIC.find_GICMAP_simplices_with_functional_minimal_cover();
+  GIC.plot_with_KeplerMapper();
+
+  Simplex_tree stree; GIC.create_complex(stree);
+
+  std::streambuf* streambufffer = std::cout.rdbuf();
+  std::ostream output_stream(streambufffer);
+
+  // ------------------------------------------
+  // Display information about the Mapper Delta
+  // ------------------------------------------
+
+  if(verb){
+    output_stream << "Mapper Delta is of dimension " << stree.dimension() <<
+                   " - " << stree.num_simplices() << " simplices - " <<
+                   stree.num_vertices() << " vertices." << std::endl;
+
+    output_stream << "Iterator on Mapper Delta simplices" << std::endl;
+    for (auto f_simplex : stree.filtration_simplex_range()) {
+      for (auto vertex : stree.simplex_vertex_range(f_simplex)) {
+        output_stream << vertex << " ";
+      }
+      output_stream << std::endl;
+    }
+  }
+
+  return 0;
+}