persistence_intervals/compute_birth_death_range_in_persistence_diagram.cpp

/*    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):       Pawel Dlotko
 *
 *    Copyright (C) 2016 Inria
 *
 *    Modification(s):
 *      - YYYY/MM Author: Description of the modification
 */
 
#include <iostream>
#include <vector>
#include <limits>
#include <utility>
 
#include <gudhi/Persistence_intervals.h>
 
using Persistence_intervals = Gudhi::Persistence_representations::Persistence_intervals;
 
int main(int argc, char** argv)
{
  std::clog << "This program computes the range of birth and death times of persistence pairs in diagrams provided as "
            << "an input.\n"
            << "The first parameter is the dimension of persistence to be used to create persistence intervals. "
            << "If your file contains the information about dimension of persistence pairs, please provide here the "
            << "dimension of persistence pairs you want to use. "
            << "If your input files consist only of birth-death pairs, please set this first parameter to -1.\n"
            << "The remaining parameters of the program are the names of files with persistence diagrams.\n";
 
  if (argc < 3) {
    std::clog << "Wrong parameter list, the program will now terminate \n";
    return 1;
  }
 
  unsigned dimension = std::numeric_limits<unsigned>::max();
  int dim = atoi(argv[1]);
  if (dim >= 0) {
    dimension = (unsigned)dim;
  }
  std::vector<const char*> filenames;
  for (int i = 2; i < argc; ++i) {
    filenames.push_back(argv[i]);
  }
 
  double min = std::numeric_limits<double>::max();
  double max = -std::numeric_limits<double>::max();
 
  for (std::size_t file_no = 0; file_no != filenames.size(); ++file_no) {
    std::clog << "Creating diagram based on a file : " << filenames[file_no] << std::endl;
    Persistence_intervals p(filenames[file_no], dimension);
    std::pair<double, double> min_max = p.get_x_range();
    if (min_max.first < min) min = min_max.first;
    if (min_max.second > max) max = min_max.second;
  }
  std::clog << "Birth-death range : min: " << min << ", max: " << max << std::endl;
  return 0;
}