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author | Vincent Rouvreau <vincent.rouvreau@inria.fr> | 2022-01-21 08:24:16 +0100 |
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committer | Vincent Rouvreau <vincent.rouvreau@inria.fr> | 2022-01-21 08:24:16 +0100 |
commit | 854cb0726336013cf9faede10ba61b0c6da938d3 (patch) | |
tree | 2af6906f741904761064349f547811fb85b6000b /src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h | |
parent | a6e7f96f7d2c391e4548309174cc05f5ae05d871 (diff) | |
parent | de5aa9c891ef13c9fc2b2635bcd27ab873b0057b (diff) |
Merge master
Diffstat (limited to 'src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h')
-rw-r--r-- | src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h b/src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h new file mode 100644 index 00000000..11b379f3 --- /dev/null +++ b/src/Coxeter_triangulation/include/gudhi/Functions/Function_moment_curve_in_Rd.h @@ -0,0 +1,79 @@ +/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT. + * See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details. + * Author(s): Siargey Kachanovich + * + * Copyright (C) 2019 Inria + * + * Modification(s): + * - YYYY/MM Author: Description of the modification + */ + +#ifndef FUNCTIONS_FUNCTION_MOMENT_CURVE_IN_RD_H_ +#define FUNCTIONS_FUNCTION_MOMENT_CURVE_IN_RD_H_ + +#include <cstdlib> // for std::size_t + +#include <Eigen/Dense> + +namespace Gudhi { + +namespace coxeter_triangulation { + +/** + * \class Function_moment_curve_in_Rd + * \brief A class for the function that defines an implicit moment curve + * in the d-dimensional Euclidean space. + */ +struct Function_moment_curve_in_Rd { + /** \brief Value of the function at a specified point. + * @param[in] p The input point. The dimension needs to coincide with the ambient dimension. + */ + Eigen::VectorXd operator()(const Eigen::VectorXd& p) const { + Eigen::VectorXd result(k_); + for (std::size_t i = 1; i < d_; ++i) result(i - 1) = p(i) - p(0) * p(i - 1); + return result; + } + + /** \brief Returns the domain (ambient) dimension.. */ + std::size_t amb_d() const { return d_; }; + + /** \brief Returns the codomain dimension. */ + std::size_t cod_d() const { return k_; }; + + /** \brief Returns a point on the moment curve. */ + Eigen::VectorXd seed() const { + Eigen::VectorXd result = Eigen::VectorXd::Zero(d_); + return result; + } + + /** + * \brief Constructor of the function that defines an implicit moment curve + * in the d-dimensional Euclidean space. + * + * @param[in] r Numerical parameter. + * @param[in] d The ambient dimension. + */ + Function_moment_curve_in_Rd(double r, std::size_t d) : m_(1), k_(d - 1), d_(d), r_(r) {} + + /** + * \brief Constructor of the function that defines an implicit moment curve + * in the d-dimensional Euclidean space. + * + * @param[in] r Numerical parameter. + * @param[in] d The ambient dimension. + * @param[in] offset The offset of the moment curve. + */ + Function_moment_curve_in_Rd(double r, std::size_t d, Eigen::VectorXd& offset) + : m_(1), k_(d - 1), d_(d), r_(r), off_(offset) {} + + private: + std::size_t m_, k_, d_; + double r_; + Eigen::VectorXd off_; +}; + +} // namespace coxeter_triangulation + +} // namespace Gudhi + +#endif |