Loading...
Searching...
No Matches
persistence_intervals/compute_bottleneck_distance.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 <gudhi/Persistence_intervals_with_distances.h>
#include <iostream>
#include <sstream>
#include <limits>
#include <vector>
using Persistence_intervals_with_distances = Gudhi::Persistence_representations::Persistence_intervals_with_distances;
int main(int argc, char** argv) {
std::clog << "This program computes the bottleneck distance 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 number of parameters, 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]);
}
// reading the persistence intervals:
std::vector<Persistence_intervals_with_distances> persistence_intervals;
for (size_t i = 0; i != filenames.size(); ++i) {
Persistence_intervals_with_distances pers(filenames[i], dimension);
persistence_intervals.push_back(pers);
}
// and now we will compute the scalar product of landscapes.
// first we prepare an array:
std::vector<std::vector<double> > distance(filenames.size());
for (size_t i = 0; i != filenames.size(); ++i) {
std::vector<double> v(filenames.size(), 0);
distance[i] = v;
}
// and now we can compute the distances:
for (size_t i = 0; i != persistence_intervals.size(); ++i) {
for (size_t j = i + 1; j != persistence_intervals.size(); ++j) {
distance[i][j] = distance[j][i] = persistence_intervals[i].distance(persistence_intervals[j]);
}
}
// and now output the result to the screen and a file:
std::ofstream out;
out.open("distance.itv");
for (size_t i = 0; i != distance.size(); ++i) {
for (size_t j = 0; j != distance.size(); ++j) {
std::clog << distance[i][j] << " ";
out << distance[i][j] << " ";
}
std::clog << std::endl;
out << std::endl;
}
out.close();
std::clog << "Distance can be found in 'distance.itv' file\n";
return 0;
}