From 8d7329f3e5ad843e553c3c5503cecc28ef2eead6 Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspreemann@gmail.com>
Date: Thu, 20 Apr 2017 11:10:45 +0200
Subject: GUDHI 2.0.0 as released by upstream in a tarball.

---
 ...mple_one_skeleton_rips_from_distance_matrix.cpp | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 example/Rips_complex/example_one_skeleton_rips_from_distance_matrix.cpp

(limited to 'example/Rips_complex/example_one_skeleton_rips_from_distance_matrix.cpp')

diff --git a/example/Rips_complex/example_one_skeleton_rips_from_distance_matrix.cpp b/example/Rips_complex/example_one_skeleton_rips_from_distance_matrix.cpp
new file mode 100644
index 00000000..bbc3c755
--- /dev/null
+++ b/example/Rips_complex/example_one_skeleton_rips_from_distance_matrix.cpp
@@ -0,0 +1,58 @@
+#include <gudhi/Rips_complex.h>
+#include <gudhi/Simplex_tree.h>
+#include <gudhi/distance_functions.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <limits>  // for std::numeric_limits
+
+int main() {
+  // Type definitions
+  using Simplex_tree = Gudhi::Simplex_tree<>;
+  using Filtration_value = Simplex_tree::Filtration_value;
+  using Rips_complex = Gudhi::rips_complex::Rips_complex<Filtration_value>;
+  using Distance_matrix = std::vector<std::vector<Filtration_value>>;
+
+  // User defined distance matrix is:
+  // | 0    0.94 0.77 0.99 0.11  |
+  // | 0.94 0    0.26 0.99 0.39  |
+  // | 0.77 0.26 0    0.28 0.97  |
+  // | 0.99 0.99 0.28 0    0.30  |
+  // | 0.11 0.39 0.97 0.30 0     |
+
+  Distance_matrix distances;
+  distances.push_back({});
+  distances.push_back({0.94});
+  distances.push_back({0.77, 0.26});
+  distances.push_back({0.99, 0.99, 0.28});
+  distances.push_back({0.11, 0.39, 0.97, 0.30});
+
+  // ----------------------------------------------------------------------------
+  // Init of a Rips complex from points
+  // ----------------------------------------------------------------------------
+  double threshold = 1.0;
+  Rips_complex rips_complex_from_points(distances, threshold);
+
+  Simplex_tree stree;
+  rips_complex_from_points.create_complex(stree, 1);
+  // ----------------------------------------------------------------------------
+  // Display information about the one skeleton Rips complex
+  // ----------------------------------------------------------------------------
+  std::cout << "Rips complex is of dimension " << stree.dimension() <<
+               " - " << stree.num_simplices() << " simplices - " <<
+               stree.num_vertices() << " vertices." << std::endl;
+
+  std::cout << "Iterator on Rips complex simplices in the filtration order, with [filtration value]:" <<
+               std::endl;
+  for (auto f_simplex : stree.filtration_simplex_range()) {
+    std::cout << "   ( ";
+    for (auto vertex : stree.simplex_vertex_range(f_simplex)) {
+      std::cout << vertex << " ";
+    }
+    std::cout << ") -> " << "[" << stree.filtration(f_simplex) << "] ";
+    std::cout << std::endl;
+  }
+
+  return 0;
+}
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