Bitmap_cubical_complex/Bitmap_cubical_complex_periodic_boundary_conditions.cpp

/* 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) 2015 INRIA Saclay (France)

*

* 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/reader_utils.h>

#include <gudhi/Bitmap_cubical_complex.h>

#include <gudhi/Bitmap_cubical_complex_periodic_boundary_conditions_base.h>

#include <gudhi/Persistent_cohomology.h>

// standard stuff

#include <iostream>

#include <sstream>

#include <vector>

int main(int argc, char** argv) {

std::cout << "This program computes persistent homology, by using " <<

"Bitmap_cubical_complex_periodic_boundary_conditions class, of cubical complexes provided in text files in " <<

"Perseus style (the only numbered in the first line is a dimension D of a bitmap. In the lines I between 2 " <<

"and D+1 there are numbers of top dimensional cells in the direction I. Let N denote product of the numbers " <<

"in the lines between 2 and D. In the lines D+2 to D+2+N there are filtrations of top dimensional cells. We " <<

"assume that the cells are in the lexicographical order. See CubicalOneSphere.txt or CubicalTwoSphere.txt for" <<

" example.\n" << std::endl;

int p = 2;

double min_persistence = 0;

if (argc != 2) {

std::cerr << "Wrong number of parameters. Please provide the name of a file with a Perseus style bitmap at " <<

"the input. The program will now terminate.\n";

return 1;

}

typedef Gudhi::cubical_complex::Bitmap_cubical_complex_periodic_boundary_conditions_base<double> Bitmap_base;

Bitmap_cubical_complex b(argv[1]);

typedef Gudhi::persistent_cohomology::Persistent_cohomology<Bitmap_cubical_complex, Field_Zp> Persistent_cohomology;

// Compute the persistence diagram of the complex

Persistent_cohomology pcoh(b, true);

pcoh.init_coefficients(p); // initializes the coefficient field for homology

pcoh.compute_persistent_cohomology(min_persistence);

std::stringstream ss;

ss << argv[1] << "_persistence";

std::ofstream out(ss.str().c_str());

pcoh.output_diagram(out);

out.close();

std::cout << "Result in file: " << ss.str().c_str() << "\n";

return 0;

}

GUDHI Version 2.0.0 - C++ library for Topological Data Analysis (TDA) and Higher Dimensional Geometry Understanding. | Generated on Wed Apr 19 2017 22:26:16 for GUDHI by 1.8.11 |