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Diffstat (limited to 'example/Bitmap_cubical_complex/Bitmap_cubical_complex.cpp')
| -rw-r--r-- | example/Bitmap_cubical_complex/Bitmap_cubical_complex.cpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/example/Bitmap_cubical_complex/Bitmap_cubical_complex.cpp b/example/Bitmap_cubical_complex/Bitmap_cubical_complex.cpp new file mode 100644 index 00000000..e6bc6648 --- /dev/null +++ b/example/Bitmap_cubical_complex/Bitmap_cubical_complex.cpp @@ -0,0 +1,72 @@ +/* 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; +} + |