diff options
Diffstat (limited to 'src/Bottleneck_distance/example/bottleneck_read_file_example.cpp')
-rw-r--r-- | src/Bottleneck_distance/example/bottleneck_read_file_example.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp b/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp new file mode 100644 index 00000000..4a503e4c --- /dev/null +++ b/src/Bottleneck_distance/example/bottleneck_read_file_example.cpp @@ -0,0 +1,77 @@ +/* This file is part of the Gudhi Library. The Gudhi library + * (Geometric Understanding in Higher Dimensions) is a generic C++ + * library for computational topology. + * + * Authors: Francois Godi, small modifications by 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/>. + */ + +#define CGAL_HAS_THREADS + +#include <gudhi/Bottleneck.h> +#include <iostream> +#include <fstream> +#include <sstream> +#include <string> + +std::vector< std::pair<double, double> > read_diagram_from_file( const char* filename ) +{ + std::ifstream in; + in.open( filename ); + std::vector< std::pair<double, double> > result; + if ( !in.is_open() ) + { + std::cerr << "File : " << filename << " do not exist. The program will now terminate \n"; + throw "File do not exist \n"; + } + + std::string line; + while (!in.eof()) + { + getline(in,line); + if ( line.length() != 0 ) + { + std::stringstream lineSS; + lineSS << line; + double beginn, endd; + lineSS >> beginn; + lineSS >> endd; + result.push_back( std::make_pair( beginn , endd ) ); + } + } + in.close(); + return result; +} //read_diagram_from_file + +int main( int argc , char** argv ) +{ + if ( argc < 3 ) + { + std::cout << "To run this program please provide as an input two files with persistence diagrams. Each file " << + "should contain a birth-death pair per line. Third, optional parameter is an error bound on a bottleneck" << + " distance (set by default to zero). The program will now terminate \n"; + } + std::vector< std::pair< double , double > > diag1 = read_diagram_from_file( argv[1] ); + std::vector< std::pair< double , double > > diag2 = read_diagram_from_file( argv[2] ); + double tolerance = 0.; + if ( argc == 4 ) + { + tolerance = atof( argv[3] ); + } + double b = Gudhi::bottleneck_distance::compute(diag1, diag2, tolerance); + std::cout << "The distance between the diagrams is : " << b << ". The tolerance is : " << tolerance << std::endl; +} |