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author | mcarrier <mcarrier@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2017-01-26 18:15:01 +0000 |
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committer | mcarrier <mcarrier@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2017-01-26 18:15:01 +0000 |
commit | 2541dd198e10ffebad5cff7c97b192199db38f88 (patch) | |
tree | e9de1684b40c70e2e78697ba700c24771f7999ea /src/Nerve_GIC/example | |
parent | 3459c495a4bd7ffc0d17d1dee02b9416d74b3cd0 (diff) |
git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/Nerve_GIC@2018 636b058d-ea47-450e-bf9e-a15bfbe3eedb
Former-commit-id: 0741bf2fb85724b6c9ef28f946e5e2a0489adaed
Diffstat (limited to 'src/Nerve_GIC/example')
-rw-r--r-- | src/Nerve_GIC/example/simple_GIC.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/Nerve_GIC/example/simple_GIC.cpp b/src/Nerve_GIC/example/simple_GIC.cpp new file mode 100644 index 00000000..33ebfcbb --- /dev/null +++ b/src/Nerve_GIC/example/simple_GIC.cpp @@ -0,0 +1,82 @@ +#include <gudhi/Rips_complex.h> +// to construct Rips_complex from a OFF file of points +#include <gudhi/Points_off_io.h> +#include <gudhi/Simplex_tree.h> +#include <gudhi/distance_functions.h> +#include <gudhi/GIC.h> + +#include <iostream> +#include <string> +#include <vector> + +void usage(int nbArgs, char * const progName) { + std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n"; + std::cerr << "Usage: " << progName << " filename.off threshold dim_max [ouput_file.txt]\n"; + std::cerr << " i.e.: " << progName << " ../../data/points/alphacomplexdoc.off 60.0\n"; + exit(-1); // ----- >> +} + +int main(int argc, char **argv) { + if ((argc != 4) && (argc != 5)) usage(argc, (argv[0] - 1)); + + std::string off_file_name(argv[1]); + double threshold = atof(argv[2]); + int dim_max = atoi(argv[3]); + + // Type definitions + using Point = std::vector<float>; + using Simplex_tree = Gudhi::Simplex_tree<>; + using Filtration_value = Simplex_tree::Filtration_value; + using Rips_complex = Gudhi::rips_complex::Rips_complex<Filtration_value>; + using Graph_t = boost::adjacency_list < boost::vecS, boost::vecS, boost::undirectedS,\ + boost::property < vertex_filtration_t, Filtration_value >,\ + boost::property < edge_filtration_t, Filtration_value > >; + using Cover = std::map<int,int>; + + // ---------------------------------------------------------------------------- + // Init of a graph induced complex from an OFF file + // ---------------------------------------------------------------------------- + Gudhi::Points_off_reader<Point> off_reader(off_file_name); + Rips_complex rips_complex_from_points(off_reader.get_point_cloud(), threshold, Euclidean_distance()); + Simplex_tree st; + rips_complex_from_points.create_complex(st, 1); + Cover C; + Gudhi::graph_induced_complex::Graph_induced_complex GIC(st,C,dim_max); + Simplex_tree stree; + GIC.create_complex(stree); + + + std::streambuf* streambufffer; + std::ofstream ouput_file_stream; + + if (argc == 5) { + ouput_file_stream.open(std::string(argv[4])); + streambufffer = ouput_file_stream.rdbuf(); + } else { + streambufffer = std::cout.rdbuf(); + } + + std::ostream output_stream(streambufffer); + + // ---------------------------------------------------------------------------- + // Display information about the graph induced complex + // ---------------------------------------------------------------------------- + output_stream << "Graph induced complex is of dimension " << stree.dimension() << + " - " << stree.num_simplices() << " simplices - " << + stree.num_vertices() << " vertices." << std::endl; + + output_stream << "Iterator on graph induced complex simplices in the filtration order, with [filtration value]:" << + std::endl; + for (auto f_simplex : stree.filtration_simplex_range()) { + output_stream << " ( "; + for (auto vertex : stree.simplex_vertex_range(f_simplex)) { + output_stream << vertex << " "; + } + output_stream << ") -> " << "[" << stree.filtration(f_simplex) << "] "; + output_stream << std::endl; + } + + ouput_file_stream.close(); + + return 0; +} |