persistence_landscapes_on_grid/compute_scalar_product_of_landscapes_on_grid.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_landscape_on_grid.h>
#include <iostream>
#include <sstream>
#include <vector>
int main(int argc, char** argv) {
std::clog
<< "This program computes scalar product of persistence landscapes on grid stored in a file (the file needs to "
<< "be created beforehand). \n"
<< "The parameters of this programs are names of files with persistence landscapes on grid.\n";
if (argc < 3) {
std::clog << "Wrong number of parameters, the program will now terminate \n";
return 1;
}
std::vector<const char*> filenames;
for (int i = 1; i < argc; ++i) {
filenames.push_back(argv[i]);
}
std::vector<Persistence_landscape_on_grid> landscaspes;
landscaspes.reserve(filenames.size());
for (size_t file_no = 0; file_no != filenames.size(); ++file_no) {
l.load_landscape_from_file(filenames[file_no]);
landscaspes.push_back(l);
}
// and now we will compute the scalar product of landscapes.
// first we prepare an array:
std::vector<std::vector<double> > scalar_product(filenames.size());
for (size_t i = 0; i != filenames.size(); ++i) {
std::vector<double> v(filenames.size(), 0);
scalar_product[i] = v;
}
// and now we can compute the scalar product:
for (size_t i = 0; i != landscaspes.size(); ++i) {
for (size_t j = i; j != landscaspes.size(); ++j) {
scalar_product[i][j] = scalar_product[j][i] = compute_inner_product(landscaspes[i], landscaspes[j]);
}
}
// and now output the result to the screen and a file:
std::ofstream out;
out.open("scalar_product.g_land");
for (size_t i = 0; i != scalar_product.size(); ++i) {
for (size_t j = 0; j != scalar_product.size(); ++j) {
std::clog << scalar_product[i][j] << " ";
out << scalar_product[i][j] << " ";
}
std::clog << std::endl;
out << std::endl;
}
out.close();
std::clog << "Distance can be found in 'scalar_product.g_land' file\n";
return 0;
}
A class implementing persistence landscapes by approximating them on a collection of grid points.
Definition: Persistence_landscape_on_grid.h:59
void load_landscape_from_file(const char *filename)
Definition: Persistence_landscape_on_grid.h:1144