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#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
void usage(int nbArgs, char * const progName) {
std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
std::cerr << "Usage: " << progName << " threshold\n";
std::cerr << " i.e.: " << progName << " 12.0\n";
exit(-1); // ----- >>
}
int main(int argc, char **argv) {
if (argc != 2) usage(argc, argv[0]);
double threshold = atof(argv[1]);
// Type definitions
using Simplex_tree = Gudhi::Simplex_tree<Gudhi::Simplex_tree_options_fast_persistence>;
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
// ----------------------------------------------------------------------------
Rips_complex rips_complex_from_points(distances, threshold);
Simplex_tree stree;
if (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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