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-rw-r--r--example/Rips_complex/example_one_skeleton_rips_from_correlation_matrix.cpp81
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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
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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;
-}