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Diffstat (limited to 'src/Bottleneck_distance/example')
3 files changed, 137 insertions, 0 deletions
diff --git a/src/Bottleneck_distance/example/CMakeLists.txt b/src/Bottleneck_distance/example/CMakeLists.txt new file mode 100644 index 00000000..c66623e9 --- /dev/null +++ b/src/Bottleneck_distance/example/CMakeLists.txt @@ -0,0 +1,15 @@ +cmake_minimum_required(VERSION 2.6) +project(Bottleneck_distance_examples) + +# requires CGAL 4.8 +# cmake -DCGAL_DIR=~/workspace/CGAL-4.8 ../../.. +if(CGAL_FOUND) + if (NOT CGAL_VERSION VERSION_LESS 4.8.0) + if (EIGEN3_FOUND) + add_executable (bottleneck_read_file_example bottleneck_read_file_example.cpp) + add_executable (bottleneck_basic_example bottleneck_basic_example.cpp) + + add_test(bottleneck_basic_example ${CMAKE_CURRENT_BINARY_DIR}/bottleneck_basic_example) + endif() + endif () +endif() diff --git a/src/Bottleneck_distance/example/bottleneck_basic_example.cpp b/src/Bottleneck_distance/example/bottleneck_basic_example.cpp new file mode 100644 index 00000000..d0ca4e20 --- /dev/null +++ b/src/Bottleneck_distance/example/bottleneck_basic_example.cpp @@ -0,0 +1,50 @@ +/* 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 + * + * 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/Bottleneck.h> + +#include <iostream> +#include <vector> +#include <utility> // for pair +#include <limits> // for numeric_limits + +int main() { + std::vector< std::pair<double, double> > v1, v2; + + v1.emplace_back(2.7, 3.7); + v1.emplace_back(9.6, 14.); + v1.emplace_back(34.2, 34.974); + v1.emplace_back(3., std::numeric_limits<double>::infinity()); + + v2.emplace_back(2.8, 4.45); + v2.emplace_back(9.5, 14.1); + v2.emplace_back(3.2, std::numeric_limits<double>::infinity()); + + + double b = Gudhi::persistence_diagram::bottleneck_distance(v1, v2); + + std::cout << "Bottleneck distance = " << b << std::endl; + + b = Gudhi::persistence_diagram::bottleneck_distance(v1, v2, 0.1); + + std::cout << "Approx bottleneck distance = " << b << std::endl; +} 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..bde05825 --- /dev/null +++ b/src/Bottleneck_distance/example/bottleneck_read_file_example.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. + * + * Authors: Francois Godi, small modifications by Pawel Dlotko + * + * Copyright (C) 2015 INRIA + * + * 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 <vector> +#include <utility> // for pair +#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::persistence_diagram::bottleneck_distance(diag1, diag2, tolerance); + std::cout << "The distance between the diagrams is : " << b << ". The tolerance is : " << tolerance << std::endl; +} |