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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): Clément Maria
*
* Copyright (C) 2014 Inria
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
#include <gudhi/Rips_complex.h>
#include <gudhi/distance_functions.h>
#include <gudhi/Simplex_tree.h>
#include <gudhi/Persistent_cohomology.h>
#include <gudhi/Persistent_cohomology/Multi_field.h>
#include <gudhi/Points_off_io.h>
#include <boost/program_options.hpp>
#include <string>
#include <vector>
// Types definition
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 Multi_field = Gudhi::persistent_cohomology::Multi_field;
using Persistent_cohomology = Gudhi::persistent_cohomology::Persistent_cohomology<Simplex_tree, Multi_field >;
using Point = std::vector<double>;
using Points_off_reader = Gudhi::Points_off_reader<Point>;
void program_options(int argc, char * argv[]
, std::string & off_file_points
, std::string & filediag
, Filtration_value & threshold
, int & dim_max
, int & min_p
, int & max_p
, Filtration_value & min_persistence);
int main(int argc, char * argv[]) {
std::string off_file_points;
std::string filediag;
Filtration_value threshold;
int dim_max;
int min_p;
int max_p;
Filtration_value min_persistence;
program_options(argc, argv, off_file_points, filediag, threshold, dim_max, min_p, max_p, min_persistence);
Points_off_reader off_reader(off_file_points);
Rips_complex rips_complex_from_file(off_reader.get_point_cloud(), threshold, Gudhi::Euclidean_distance());
// Construct the Rips complex in a Simplex Tree
Simplex_tree simplex_tree;
rips_complex_from_file.create_complex(simplex_tree, dim_max);
std::clog << "The complex contains " << simplex_tree.num_simplices() << " simplices \n";
std::clog << " and has dimension " << simplex_tree.dimension() << " \n";
// Compute the persistence diagram of the complex
Persistent_cohomology pcoh(simplex_tree);
// initializes the coefficient field for homology
pcoh.init_coefficients(min_p, max_p);
pcoh.compute_persistent_cohomology(min_persistence);
// Output the diagram in filediag
if (filediag.empty()) {
pcoh.output_diagram();
} else {
std::ofstream out(filediag);
pcoh.output_diagram(out);
out.close();
}
return 0;
}
void program_options(int argc, char * argv[]
, std::string & off_file_points
, std::string & filediag
, Filtration_value & threshold
, int & dim_max
, int & min_p
, int & max_p
, Filtration_value & min_persistence) {
namespace po = boost::program_options;
po::options_description hidden("Hidden options");
hidden.add_options()
("input-file", po::value<std::string>(&off_file_points),
"Name of an OFF file containing a point set.\n");
po::options_description visible("Allowed options");
visible.add_options()
("help,h", "produce help message")
("output-file,o", po::value<std::string>(&filediag)->default_value(std::string()),
"Name of file in which the persistence diagram is written. Default print in std::clog")
("max-edge-length,r", po::value<Filtration_value>(&threshold)->default_value(0),
"Maximal length of an edge for the Rips complex construction.")
("cpx-dimension,d", po::value<int>(&dim_max)->default_value(1),
"Maximal dimension of the Rips complex we want to compute.")
("min-field-charac,p", po::value<int>(&min_p)->default_value(2),
"Minimal characteristic p of the coefficient field Z/pZ.")
("max-field-charac,q", po::value<int>(&max_p)->default_value(1223),
"Minimial characteristic q of the coefficient field Z/pZ.")
("min-persistence,m", po::value<Filtration_value>(&min_persistence),
"Minimal lifetime of homology feature to be recorded. Default is 0");
po::positional_options_description pos;
pos.add("input-file", 1);
po::options_description all;
all.add(visible).add(hidden);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv).
options(all).positional(pos).run(), vm);
po::notify(vm);
if (vm.count("help") || !vm.count("input-file")) {
std::clog << std::endl;
std::clog << "Compute the persistent homology with various coefficient fields \n";
std::clog << "of a Rips complex defined on a set of input points. The coefficient \n";
std::clog << "fields are all the Z/rZ for a prime number r contained in the \n";
std::clog << "specified range [p,q]\n \n";
std::clog << "The output diagram contains one bar per line, written with the convention: \n";
std::clog << " p1*...*pr dim b d \n";
std::clog << "where dim is the dimension of the homological feature,\n";
std::clog << "b and d are respectively the birth and death of the feature and \n";
std::clog << "p1*...*pr is the product of prime numbers pi such that the homology \n";
std::clog << "feature exists in homology with Z/piZ coefficients." << std::endl << std::endl;
std::clog << "Usage: " << argv[0] << " [options] input-file" << std::endl << std::endl;
std::clog << visible << std::endl;
exit(-1);
}
}
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