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diff --git a/src/Gudhi_stat/utilities/persistence_landscapes_on_grid/compute_scalar_product_of_landscapes_on_grid.cpp b/src/Gudhi_stat/utilities/persistence_landscapes_on_grid/compute_scalar_product_of_landscapes_on_grid.cpp
new file mode 100644
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--- /dev/null
+++ b/src/Gudhi_stat/utilities/persistence_landscapes_on_grid/compute_scalar_product_of_landscapes_on_grid.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 (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_on_grid.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 on grid 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 on grid.\n";
+
+	std::vector< const char* > filenames;
+	for ( int i = 1 ; i < argc ; ++i )
+	{
+		filenames.push_back( argv[i] );
+	}
+	std::vector< Persistence_landscape_on_grid > landscaspes;
+	landscaspes.reserve( filenames.size() );
+	for ( size_t file_no = 0 ; file_no != filenames.size() ; ++file_no )
+	{
+		Persistence_landscape_on_grid 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;
+}