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diff --git a/utilities/Alpha_complex/alpha_complex_persistence.cpp b/utilities/Alpha_complex/alpha_complex_persistence.cpp
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-/* This file is part of the Gudhi Library. The Gudhi library
- * (Geometric Understanding in Higher Dimensions) is a generic C++
- * library for computational topology.
- *
- * Author(s): Vincent Rouvreau
- *
- * Copyright (C) 2016 Inria
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <boost/program_options.hpp>
-
-#include <CGAL/Epick_d.h>
-
-#include <gudhi/Alpha_complex.h>
-#include <gudhi/Persistent_cohomology.h>
-// to construct a simplex_tree from alpha complex
-#include <gudhi/Simplex_tree.h>
-
-#include <iostream>
-#include <string>
-#include <limits> // for numeric_limits
-
-using Simplex_tree = Gudhi::Simplex_tree<>;
-using Filtration_value = Simplex_tree::Filtration_value;
-
-void program_options(int argc, char *argv[], std::string &off_file_points, std::string &output_file_diag,
- Filtration_value &alpha_square_max_value, int &coeff_field_characteristic,
- Filtration_value &min_persistence);
-
-int main(int argc, char **argv) {
- std::string off_file_points;
- std::string output_file_diag;
- Filtration_value alpha_square_max_value;
- int coeff_field_characteristic;
- Filtration_value min_persistence;
-
- program_options(argc, argv, off_file_points, output_file_diag, alpha_square_max_value, coeff_field_characteristic,
- min_persistence);
-
- // ----------------------------------------------------------------------------
- // Init of an alpha complex from an OFF file
- // ----------------------------------------------------------------------------
- using Kernel = CGAL::Epick_d<CGAL::Dynamic_dimension_tag>;
- Gudhi::alpha_complex::Alpha_complex<Kernel> alpha_complex_from_file(off_file_points);
-
- Simplex_tree simplex;
- if (alpha_complex_from_file.create_complex(simplex, alpha_square_max_value)) {
- // ----------------------------------------------------------------------------
- // Display information about the alpha complex
- // ----------------------------------------------------------------------------
- std::cout << "Simplicial complex is of dimension " << simplex.dimension() << " - " << simplex.num_simplices()
- << " simplices - " << simplex.num_vertices() << " vertices." << std::endl;
-
- // Sort the simplices in the order of the filtration
- simplex.initialize_filtration();
-
- std::cout << "Simplex_tree dim: " << simplex.dimension() << std::endl;
- // Compute the persistence diagram of the complex
- Gudhi::persistent_cohomology::Persistent_cohomology<Simplex_tree, Gudhi::persistent_cohomology::Field_Zp> pcoh(
- simplex);
- // initializes the coefficient field for homology
- pcoh.init_coefficients(coeff_field_characteristic);
-
- pcoh.compute_persistent_cohomology(min_persistence);
-
- // Output the diagram in filediag
- if (output_file_diag.empty()) {
- pcoh.output_diagram();
- } else {
- std::cout << "Result in file: " << output_file_diag << std::endl;
- std::ofstream out(output_file_diag);
- pcoh.output_diagram(out);
- out.close();
- }
- }
-
- return 0;
-}
-
-void program_options(int argc, char *argv[], std::string &off_file_points, std::string &output_file_diag,
- Filtration_value &alpha_square_max_value, int &coeff_field_characteristic,
- 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 file containing a point set. Format is one point per line: X1 ... Xd ");
-
- po::options_description visible("Allowed options", 100);
- visible.add_options()("help,h", "produce help message")(
- "output-file,o", po::value<std::string>(&output_file_diag)->default_value(std::string()),
- "Name of file in which the persistence diagram is written. Default print in std::cout")(
- "max-alpha-square-value,r", po::value<Filtration_value>(&alpha_square_max_value)
- ->default_value(std::numeric_limits<Filtration_value>::infinity()),
- "Maximal alpha square value for the Alpha complex construction.")(
- "field-charac,p", po::value<int>(&coeff_field_characteristic)->default_value(11),
- "Characteristic p of the coefficient field Z/pZ for computing homology.")(
- "min-persistence,m", po::value<Filtration_value>(&min_persistence),
- "Minimal lifetime of homology feature to be recorded. Default is 0. Enter a negative value to see zero length "
- "intervals");
-
- 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::cout << std::endl;
- std::cout << "Compute the persistent homology with coefficient field Z/pZ \n";
- std::cout << "of an Alpha complex defined on a set of input points.\n \n";
- std::cout << "The output diagram contains one bar per line, written with the convention: \n";
- std::cout << " p dim b d \n";
- std::cout << "where dim is the dimension of the homological feature,\n";
- std::cout << "b and d are respectively the birth and death of the feature and \n";
- std::cout << "p is the characteristic of the field Z/pZ used for homology coefficients." << std::endl << std::endl;
-
- std::cout << "Usage: " << argv[0] << " [options] input-file" << std::endl << std::endl;
- std::cout << visible << std::endl;
- exit(-1);
- }
-}