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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) 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/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 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_base<double> Bitmap_cubical_complex_base;
typedef Gudhi::cubical_complex::Bitmap_cubical_complex<Bitmap_cubical_complex_base> Bitmap_cubical_complex;
typedef Gudhi::persistent_cohomology::Field_Zp Field_Zp;
typedef Gudhi::persistent_cohomology::Persistent_cohomology<Bitmap_cubical_complex, Field_Zp> Persistent_cohomology;
Bitmap_cubical_complex b(argv[1]);
// Compute the persistence diagram of the complex
Persistent_cohomology pcoh(b);
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;
}
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