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Diffstat (limited to 'src/Witness_complex/example/example_nearest_landmark_table.cpp')
-rw-r--r-- | src/Witness_complex/example/example_nearest_landmark_table.cpp | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/Witness_complex/example/example_nearest_landmark_table.cpp b/src/Witness_complex/example/example_nearest_landmark_table.cpp new file mode 100644 index 00000000..441900c1 --- /dev/null +++ b/src/Witness_complex/example/example_nearest_landmark_table.cpp @@ -0,0 +1,44 @@ +#define BOOST_PARAMETER_MAX_ARITY 12 + +#include <gudhi/Simplex_tree.h> +#include <gudhi/Witness_complex.h> +#include <gudhi/Persistent_cohomology.h> + +#include <iostream> +#include <fstream> +#include <utility> +#include <string> +#include <vector> + +int main(int argc, char * const argv[]) { + using Nearest_landmark_range = std::vector<std::pair<std::size_t, double>>; + using Nearest_landmark_table = std::vector<Nearest_landmark_range>; + using Witness_complex = Gudhi::witness_complex::Witness_complex<Nearest_landmark_table>; + using Simplex_tree = Gudhi::Simplex_tree<>; + using Field_Zp = Gudhi::persistent_cohomology::Field_Zp; + using Persistent_cohomology = Gudhi::persistent_cohomology::Persistent_cohomology<Simplex_tree, Field_Zp>; + + Simplex_tree simplex_tree; + + // Example contains 5 witnesses and 5 landmarks + Nearest_landmark_table nlt = { + {{0, 0.0}, {1, 0.1}, {2, 0.2}, {3, 0.3}, {4, 0.4}}, // witness 0 + {{1, 0.0}, {2, 0.1}, {3, 0.2}, {4, 0.3}, {0, 0.4}}, // witness 1 + {{2, 0.0}, {3, 0.1}, {4, 0.2}, {0, 0.3}, {1, 0.4}}, // witness 2 + {{3, 0.0}, {4, 0.1}, {0, 0.2}, {1, 0.3}, {2, 0.4}}, // witness 3 + {{4, 0.0}, {0, 0.1}, {1, 0.2}, {2, 0.3}, {3, 0.4}} // witness 4 + }; + /* distance(witness3, landmark3) is 0, distance(witness3, landmark4) is 0.1, etc. */ + + Witness_complex witness_complex(nlt); + witness_complex.create_complex(simplex_tree, .41); + + std::cout << "Number of simplices: " << simplex_tree.num_simplices() << std::endl; + + Persistent_cohomology pcoh(simplex_tree); + // initializes the coefficient field for homology + pcoh.init_coefficients(11); + + pcoh.compute_persistent_cohomology(-0.1); + pcoh.output_diagram(); +} |