1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
#include <gudhi/Rips_complex.h>
// to construct Rips_complex from a OFF file of points
#include <gudhi/Points_off_io.h>
// to construct a simplex_tree from rips complex
#include <gudhi/Simplex_tree.h>
#include <gudhi/distance_functions.h>
#include <iostream>
#include <string>
#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 Point = std::vector<double>;
using Simplex_tree = Gudhi::Simplex_tree<>;
using Rips_complex = Gudhi::rips_complex::Rips_complex<Simplex_tree::Filtration_value>;
std::vector<Point> points;
points.push_back({1.0, 1.0});
points.push_back({7.0, 0.0});
points.push_back({4.0, 6.0});
points.push_back({9.0, 6.0});
points.push_back({0.0, 14.0});
points.push_back({2.0, 19.0});
points.push_back({9.0, 17.0});
// ----------------------------------------------------------------------------
// Init of a rips complex from points
// ----------------------------------------------------------------------------
Rips_complex rips_complex_from_file(points, threshold, euclidean_distance<Point>);
Simplex_tree simplex;
if (rips_complex_from_file.create_complex(simplex, 1)) {
// ----------------------------------------------------------------------------
// Display information about the one skeleton rips complex
// ----------------------------------------------------------------------------
std::cout << "Rips complex is of dimension " << simplex.dimension() <<
" - " << simplex.num_simplices() << " simplices - " <<
simplex.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 : simplex.filtration_simplex_range()) {
std::cout << " ( ";
for (auto vertex : simplex.simplex_vertex_range(f_simplex)) {
std::cout << vertex << " ";
}
std::cout << ") -> " << "[" << simplex.filtration(f_simplex) << "] ";
std::cout << std::endl;
}
}
return 0;
}
|
