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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.
*
* Authors: Francois Godi, small modifications by Pawel Dlotko
*
* Copyright (C) 2015 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/>.
*/
#define CGAL_HAS_THREADS
#include <gudhi/Bottleneck.h>
#include <iostream>
#include <vector>
#include <utility> // for pair
#include <fstream>
#include <sstream>
#include <string>
std::vector< std::pair<double, double> > read_diagram_from_file(const char* filename) {
std::ifstream in;
in.open(filename);
std::vector< std::pair<double, double> > result;
if (!in.is_open()) {
std::cerr << "File : " << filename << " do not exist. The program will now terminate \n";
throw "File do not exist \n";
}
std::string line;
while (!in.eof()) {
getline(in, line);
if (line.length() != 0) {
std::stringstream lineSS;
lineSS << line;
double beginn, endd;
lineSS >> beginn;
lineSS >> endd;
result.push_back(std::make_pair(beginn, endd));
}
}
in.close();
return result;
} // read_diagram_from_file
int main(int argc, char** argv) {
if (argc < 3) {
std::cout << "To run this program please provide as an input two files with persistence diagrams. Each file " <<
"should contain a birth-death pair per line. Third, optional parameter is an error bound on a bottleneck" <<
" distance (set by default to zero). The program will now terminate \n";
}
std::vector< std::pair< double, double > > diag1 = read_diagram_from_file(argv[1]);
std::vector< std::pair< double, double > > diag2 = read_diagram_from_file(argv[2]);
double tolerance = 0.;
if (argc == 4) {
tolerance = atof(argv[3]);
}
double b = Gudhi::persistence_diagram::bottleneck_distance(diag1, diag2, tolerance);
std::cout << "The distance between the diagrams is : " << b << ". The tolerance is : " << tolerance << std::endl;
}
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