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author | vrouvrea <vrouvrea@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2017-03-02 20:46:46 +0000 |
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committer | vrouvrea <vrouvrea@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2017-03-02 20:46:46 +0000 |
commit | effc4723dfa2604c8c505b0dfff48b4cab8012ca (patch) | |
tree | 09f0a1361644eaba294549246a59efb9e99f1451 /src/Witness_complex/example/example_witness_complex_off.cpp | |
parent | 087fdfa6bdce9c40d046c983fbe36b94b976568a (diff) | |
parent | 3602c71163c6c0b26cb866a6a5757e57a15bb6fe (diff) |
Merge relaxed-witness branch
git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/trunk@2138 636b058d-ea47-450e-bf9e-a15bfbe3eedb
Former-commit-id: 63b007a9fb25b25383d2d7de360f1efc94aa3906
Diffstat (limited to 'src/Witness_complex/example/example_witness_complex_off.cpp')
-rw-r--r-- | src/Witness_complex/example/example_witness_complex_off.cpp | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/Witness_complex/example/example_witness_complex_off.cpp b/src/Witness_complex/example/example_witness_complex_off.cpp new file mode 100644 index 00000000..b36dac0d --- /dev/null +++ b/src/Witness_complex/example/example_witness_complex_off.cpp @@ -0,0 +1,60 @@ +#include <sys/types.h> +#include <sys/stat.h> + +#include <gudhi/Simplex_tree.h> +#include <gudhi/Euclidean_witness_complex.h> +#include <gudhi/pick_n_random_points.h> +#include <gudhi/Points_off_io.h> + +#include <CGAL/Epick_d.h> + +#include <iostream> +#include <fstream> +#include <ctime> +#include <string> +#include <vector> + +using K = CGAL::Epick_d<CGAL::Dynamic_dimension_tag>; +using Point_d = K::Point_d; +using Witness_complex = Gudhi::witness_complex::Euclidean_witness_complex<K>; +using Point_vector = std::vector< Point_d >; + +int main(int argc, char * const argv[]) { + if (argc != 5) { + std::cerr << "Usage: " << argv[0] + << " path_to_point_file number_of_landmarks max_squared_alpha limit_dimension\n"; + return 0; + } + + std::string file_name = argv[1]; + int nbL = atoi(argv[2]), lim_dim = atoi(argv[4]); + double alpha2 = atof(argv[3]); + clock_t start, end; + Gudhi::Simplex_tree<> simplex_tree; + + // Read the point file + Point_vector point_vector, landmarks; + Gudhi::Points_off_reader<Point_d> off_reader(file_name); + if (!off_reader.is_valid()) { + std::cerr << "Witness complex - Unable to read file " << file_name << "\n"; + exit(-1); // ----- >> + } + point_vector = Point_vector(off_reader.get_point_cloud()); + + std::cout << "Successfully read " << point_vector.size() << " points.\n"; + std::cout << "Ambient dimension is " << point_vector[0].dimension() << ".\n"; + + // Choose landmarks + Gudhi::subsampling::pick_n_random_points(point_vector, nbL, std::back_inserter(landmarks)); + + // Compute witness complex + start = clock(); + Witness_complex witness_complex(landmarks, + point_vector); + + witness_complex.create_complex(simplex_tree, alpha2, lim_dim); + end = clock(); + std::cout << "Witness complex took " + << static_cast<double>(end - start) / CLOCKS_PER_SEC << " s. \n"; + std::cout << "Number of simplices is: " << simplex_tree.num_simplices() << "\n"; +} |