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/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
* See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
* Author(s): David Salinas
* Copyright (C) 2014 Inria
* Modification(s):
* - YYYY/MM Author: Description of the modification
#include <gudhi/Skeleton_blocker.h>
#include <gudhi/Clock.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <fstream>
#include <sstream>
typedef Complex::Simplex Simplex;
Complex build_complete_complex(int n) {
// build a full complex with n vertices and 2^n-1 simplices
Complex complex;
for (int i = 0; i < n; i++)
for (int i = 0; i < n; i++)
for (int j = 0; j < i; j++)
return complex;
int main(int argc, char *argv[]) {
Gudhi::Clock skbl_chrono("Time to build the complete complex, enumerate simplices and Euler Characteristic");
const int n = 15;
// build a full complex with n vertices and 2^n-1 simplices
Complex complex(build_complete_complex(n));
// this is just to illustrate iterators, to count number of vertices
// or edges, complex.num_vertices() and complex.num_edges() are
// more appropriated!
unsigned num_vertices = 0;
for (auto v : complex.vertex_range()) {
std::clog << "Vertex " << v << std::endl;
// such loop can also be done directly with distance as iterators are STL compliant
auto edges = complex.edge_range();
unsigned num_edges = std::distance(edges.begin(), edges.end());
unsigned euler = 0;
unsigned num_simplices = 0;
// we use a reference to a simplex instead of a copy
// value here because a simplex is a set of integers
// and copying it cost time
for (const Simplex & s : complex.complex_simplex_range()) {
if (s.dimension() % 2 == 0)
euler += 1;
euler -= 1;
std::clog << "Saw " << num_vertices << " vertices, " << num_edges << " edges and " << num_simplices << " simplices"
<< std::endl;
std::clog << "The Euler Characteristic is " << euler << std::endl;
std::clog << skbl_chrono;
Abstract Simplicial Complex represented with a skeleton/blockers pair.
Definition: Skeleton_blocker_complex.h:51
Edge_handle add_edge_without_blockers(Vertex_handle a, Vertex_handle b)
Adds an edge between vertices a and b without blockers.
Definition: Skeleton_blocker_complex.h:566
Class that represents a geometric complex that can be simplified. The class allows access to points o...
Definition: Skeleton_blocker_geometric_complex.h:29
Vertex_handle add_vertex()
Add a vertex to the complex with a default constructed associated point.
Definition: Skeleton_blocker_geometric_complex.h:85
Simple traits that is a model of SkeletonBlockerDS and can be passed as a template argument to Skelet...
Definition: Skeleton_blocker_simple_traits.h:29
Handle type for the vertices of a cell complex.
Definition: VertexHandle.h:15