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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): Pawel Dlotko
*
* 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 <gudhi/Persistence_heat_maps.h>
#include <iostream>
#include <sstream>
#include <limits>
#include <vector>
using constant_scaling_function = Gudhi::Persistence_representations::constant_scaling_function;
using Persistence_heat_maps = Gudhi::Persistence_representations::Persistence_heat_maps<constant_scaling_function>;
int main(int argc, char** argv) {
std::cout << "This program computes distance of persistence heat maps stored in files (the files needs to be "
<< "created beforehand).\n"
<< "The first parameter of a program is an integer p. The program compute L^p distance of the two heat "
<< "maps. For L^infty distance choose p = -1. \n"
<< "The remaining parameters of this program are names of files with persistence heat maps.\n";
if (argc < 3) {
std::cout << "Wrong number of parameters, the program will now terminate \n";
return 1;
}
int pp = atoi(argv[1]);
double p = std::numeric_limits<double>::max();
if (pp != -1) {
p = pp;
}
std::vector<const char*> filenames;
for (int i = 2; i < argc; ++i) {
filenames.push_back(argv[i]);
}
std::vector<Persistence_heat_maps> maps;
maps.reserve(filenames.size());
for (size_t file_no = 0; file_no != filenames.size(); ++file_no) {
Persistence_heat_maps l;
l.load_from_file(filenames[file_no]);
maps.push_back(l);
}
// 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 != filenames.size(); ++i) {
for (size_t j = i; j != filenames.size(); ++j) {
distance[i][j] = distance[j][i] = maps[i].distance(maps[j], p);
}
}
// and now output the result to the screen and a file:
std::ofstream out;
out.open("distance.mps");
for (size_t i = 0; i != distance.size(); ++i) {
for (size_t j = 0; j != distance.size(); ++j) {
std::cout << distance[i][j] << " ";
out << distance[i][j] << " ";
}
std::cout << std::endl;
out << std::endl;
}
out.close();
std::cout << "Distance can be found in 'distance.mps' file\n";
return 0;
}
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