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Diffstat (limited to 'src/Persistence_representations/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp')
-rw-r--r-- | src/Persistence_representations/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/Persistence_representations/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp b/src/Persistence_representations/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp new file mode 100644 index 00000000..02b729b2 --- /dev/null +++ b/src/Persistence_representations/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp @@ -0,0 +1,89 @@ +/* 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 (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/Persistence_landscape.h> + + + +using namespace Gudhi; +using namespace Gudhi::Persistence_representations; + +#include <iostream> +#include <sstream> + + +int main( int argc , char** argv ) +{ + std::cout << "This program compute scalar product of persistence landscapes stored in a file (the file needs to be created beforehand). \n"; + std::cout << "The parameters of this programs are names of files with persistence landscapes.\n"; + + std::vector< const char* > filenames; + for ( int i = 1 ; i < argc ; ++i ) + { + filenames.push_back( argv[i] ); + } + std::vector< Persistence_landscape > landscaspes; + landscaspes.reserve( filenames.size() ); + for ( size_t file_no = 0 ; file_no != filenames.size() ; ++file_no ) + { + std::cout << "Reading persistence landscape from a file : " << filenames[file_no] << std::endl; + Persistence_landscape l; + 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" ); + for ( size_t i = 0 ; i != scalar_product.size() ; ++i ) + { + for ( size_t j = 0 ; j != scalar_product.size() ; ++j ) + { + std::cout << scalar_product[i][j] << " "; + out << scalar_product[i][j] << " "; + } + std::cout << std::endl; + out << std::endl; + } + out.close(); + + return 0; +} |