diff options
Diffstat (limited to 'example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp')
-rw-r--r-- | example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp b/example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp deleted file mode 100644 index 05bacb9f..00000000 --- a/example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp +++ /dev/null @@ -1,81 +0,0 @@ -#include <gudhi/Rips_complex.h> -#include <gudhi/Simplex_tree.h> -#include <gudhi/distance_functions.h> - -#include <iostream> -#include <string> -#include <vector> -#include <limits> // for std::numeric_limits - -int main() { - // Type definitions - using Simplex_tree = Gudhi::Simplex_tree<>; - using Filtration_value = Simplex_tree::Filtration_value; - using Rips_complex = Gudhi::rips_complex::Rips_complex<Filtration_value>; - using Distance_matrix = std::vector<std::vector<Filtration_value>>; - - // User defined correlation matrix is: - // |1 0.06 0.23 0.01 0.89| - // |0.06 1 0.74 0.01 0.61| - // |0.23 0.74 1 0.72 0.03| - // |0.01 0.01 0.72 1 0.7 | - // |0.89 0.61 0.03 0.7 1 | - - Distance_matrix correlations; - correlations.push_back({}); - correlations.push_back({0.06}); - correlations.push_back({0.23, 0.74}); - correlations.push_back({0.01, 0.01, 0.72}); - correlations.push_back({0.89, 0.61, 0.03, 0.7}); - - // ---------------------------------------------------------------------------- - // Convert correlation matrix to a distance matrix: - // ---------------------------------------------------------------------------- - double threshold = 0; - for (size_t i = 0; i != correlations.size(); ++i) { - for (size_t j = 0; j != correlations[i].size(); ++j) { - // Here we check if our data comes from corelation matrix. - if ((correlations[i][j] < -1) || (correlations[i][j] > 1)) { - std::cerr << "The input matrix is not a correlation matrix. The program will now terminate.\n"; - throw "The input matrix is not a correlation matrix. The program will now terminate.\n"; - } - correlations[i][j] = 1 - correlations[i][j]; - // Here we make sure that we will get the treshold value equal to maximal - // distance in the matrix. - if (correlations[i][j] > threshold) threshold = correlations[i][j]; - } - } - - //----------------------------------------------------------------------------- - // Now the correlation matrix is a distance matrix and can be processed further. - //----------------------------------------------------------------------------- - Distance_matrix distances = correlations; - - Rips_complex rips_complex_from_points(distances, threshold); - - Simplex_tree stree; - rips_complex_from_points.create_complex(stree, 1); - // ---------------------------------------------------------------------------- - // Display information about the one skeleton Rips complex. Note that - // the filtration displayed here comes from the distance matrix computed - // above, which is 1 - initial correlation matrix. Only this way, we obtain - // a complex with filtration. If a correlation matrix is used instead, we would - // have a reverse filtration (i.e. filtration of boundary of each simplex S - // is greater or equal to the filtration of S). - // ---------------------------------------------------------------------------- - std::cout << "Rips complex is of dimension " << stree.dimension() << " - " << stree.num_simplices() << " simplices - " - << stree.num_vertices() << " vertices." << std::endl; - - std::cout << "Iterator on Rips complex simplices in the filtration order, with [filtration value]:" << std::endl; - for (auto f_simplex : stree.filtration_simplex_range()) { - std::cout << " ( "; - for (auto vertex : stree.simplex_vertex_range(f_simplex)) { - std::cout << vertex << " "; - } - std::cout << ") -> " - << "[" << stree.filtration(f_simplex) << "] "; - std::cout << std::endl; - } - - return 0; -} |