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persistence_heat_maps/compute_distance_of_persistence_heat_maps.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_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::clog << "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::clog << "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::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.mps' file\n";
return 0;
}
Gudhi::Persistence_representations::Persistence_heat_maps
A class implementing persistence heat maps.
Definition Persistence_heat_maps.h:178
Gudhi::Persistence_representations::Persistence_heat_maps::load_from_file
void load_from_file(const char *filename)
Definition Persistence_heat_maps.h:829
Gudhi::Persistence_representations::constant_scaling_function
Definition Persistence_heat_maps.h:106