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diff --git a/src/Gudhi_stat/example/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp b/src/Gudhi_stat/example/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp
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--- a/src/Gudhi_stat/example/utilities/persistence_landscapes/compute_scalar_product_of_landscapes.cpp
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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 Sophia-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/abstract_classes/Abs_Topological_data.h>
-#include <gudhi/concretizations/Persistence_landscape.h>
-
-
-
-using namespace Gudhi;
-using namespace Gudhi::Gudhi_stat;
-
-#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:
- 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 )
- {
- cout << scalar_product[i][j] << " ";
- out << scalar_product[i][j] << " ";
- }
- cout << endl;
- out << endl;
- }
- out.close();
-
- return 0;
-}