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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/>.
*/
//for persistence algorithm
#include <gudhi/reader_utils.h>
#include <gudhi/Bitmap_cubical_complex.h>
#include <gudhi/Persistent_cohomology.h>
using namespace Gudhi;
using namespace Gudhi::Cubical_complex;
using namespace Gudhi::persistent_cohomology;
//standard stuff
#include <iostream>
#include <sstream>
using namespace std;
int main( int argc , char** argv )
{
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." << endl;
int p = 2;
double min_persistence = 0;
if ( argc != 2 )
{
cout << "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;
}
Bitmap_cubical_complex<double> b( argv[1] );
// Compute the persistence diagram of the complex
persistent_cohomology::Persistent_cohomology< Bitmap_cubical_complex<double>, Field_Zp > pcoh(b);
pcoh.init_coefficients( p ); //initilizes the coefficient field for homology
pcoh.compute_persistent_cohomology( min_persistence );
stringstream ss;
ss << argv[1] << "_persistence";
std::ofstream out(ss.str().c_str());
pcoh.output_diagram(out);
out.close();
return 0;
}
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