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#include <gudhi/Rips_complex.h>
// to construct Rips_complex from a fvecs file of points
#include <gudhi/Simplex_tree.h>
#include <gudhi/Fake_simplex_tree.h>
#include <gudhi/distance_functions.h>
#include <gudhi/Points_fvecs_reader.h>
#include <CGAL/Epick_d.h>
#include <iostream>
#include <string>
#include <vector>
void usage(int nbArgs, char * const progName) {
std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
std::cerr << "Usage: " << progName << " filename.fvecs threshold dim_max [ouput_file.txt]\n";
std::cerr << " i.e.: " << progName << " ../../data/points/alphacomplexdoc.fvecs 60.0\n";
exit(-1); // ----- >>
}
int main(int argc, char **argv) {
if ((argc != 4) && (argc != 5)) usage(argc, (argv[0] - 1));
std::string file_name(argv[1]);
double threshold = atof(argv[2]);
int dim_max = atoi(argv[3]);
// Type definitions
using K = CGAL::Epick_d<CGAL::Dynamic_dimension_tag>;
using Point = typename K::Point_d;
//using Simplex_tree = Gudhi::Simplex_tree<>;
using Simplex_tree = Gudhi::Fake_simplex_tree;
using Filtration_value = Simplex_tree::Filtration_value;
using Rips_complex = Gudhi::rips_complex::Rips_complex<Filtration_value>;
using Point_vector = std::vector<Point>;
// ----------------------------------------------------------------------------
// Init of a Rips complex from an fvecs file
// ----------------------------------------------------------------------------
Point_vector point_vector;
Gudhi::load_points_from_fvecs_file<K>(file_name, std::back_insert_iterator< Point_vector >(point_vector));
Rips_complex rips_complex_from_file(point_vector, threshold, Gudhi::Euclidean_distance());
std::streambuf* streambufffer;
std::ofstream ouput_file_stream;
if (argc == 5) {
ouput_file_stream.open(std::string(argv[4]));
streambufffer = ouput_file_stream.rdbuf();
} else {
streambufffer = std::cout.rdbuf();
}
Simplex_tree stree;
rips_complex_from_file.create_complex(stree, dim_max);
std::ostream output_stream(streambufffer);
// ----------------------------------------------------------------------------
// Display information about the Rips complex
// ----------------------------------------------------------------------------
output_stream << "Rips complex is of dimension " << stree.dimension() <<
" - " << stree.num_simplices() << " simplices." << std::endl;
ouput_file_stream.close();
return 0;
}
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