Line data    Source code

       1           0 : // Distributed under the MIT License.
       2             : // See LICENSE.txt for details.
       3             : 
       4             : #pragma once
       5             : 
       6             : #include <cstddef>
       7             : 
       8             : #include "DataStructures/DataVector.hpp"
       9             : #include "DataStructures/Matrix.hpp"
      10             : #include "DataStructures/Tensor/TypeAliases.hpp"
      11             : #include "DataStructures/Variables.hpp"
      12             : #include "Utilities/Blas.hpp"
      13             : #include "Utilities/ErrorHandling/Assert.hpp"
      14             : #include "Utilities/Gsl.hpp"
      15             : 
      16             : /// \cond
      17             : template <size_t Dim>
      18             : class Mesh;
      19             : namespace PUP {
      20             : class er;
      21             : }  // namespace PUP
      22             : // IWYU pragma: no_forward_declare Variables
      23             : /// \endcond
      24             : 
      25             : namespace intrp {
      26             : 
      27             : /// \ingroup NumericalAlgorithmsGroup
      28             : /// \brief Interpolates a `Variables` onto an arbitrary set of points.
      29             : ///
      30             : /// \details If the `source_mesh` uses Spectral::Basis::FiniteDifference,
      31             : /// linear interpolation is done in each dimension; otherwise it uses the
      32             : /// barycentric interpolation provided by Spectral::interpolation_matrix in each
      33             : /// dimension.
      34             : template <size_t Dim>
      35           1 : class Irregular {
      36             :  public:
      37           0 :   Irregular(
      38             :       const Mesh<Dim>& source_mesh,
      39             :       const tnsr::I<DataVector, Dim, Frame::ElementLogical>& target_points);
      40           0 :   Irregular();
      41             : 
      42             :   /// Serialization for Charm++
      43             :   // NOLINTNEXTLINE(google-runtime-references)
      44           1 :   void pup(PUP::er& p);
      45             : 
      46             :   /// @{
      47             :   /// Performs the interpolation on a `Variables` with grid points corresponding
      48             :   /// to the `Mesh<Dim>` specified in the constructor.
      49             :   /// The result is a `Variables` whose internal `DataVector` goes over the
      50             :   /// list of target_points that were specified in the constructor.
      51             :   /// \note for the void function, `result` will be resized to the proper size.
      52             :   template <typename TagsList>
      53           1 :   void interpolate(gsl::not_null<Variables<TagsList>*> result,
      54             :                    const Variables<TagsList>& vars) const;
      55             :   template <typename TagsList>
      56           1 :   Variables<TagsList> interpolate(const Variables<TagsList>& vars) const;
      57             :   /// @}
      58             : 
      59             :   /// @{
      60             :   /// \brief Interpolate a DataVector onto the target points.
      61             :   ///
      62             :   /// \note When interpolating multiple tensors, the Variables interface is more
      63             :   /// efficient. However, this DataVector interface is useful for applications
      64             :   /// where only some components of a Tensor or Variables need to be
      65             :   /// interpolated.
      66           1 :   void interpolate(gsl::not_null<DataVector*> result,
      67             :                    const DataVector& input) const;
      68           1 :   DataVector interpolate(const DataVector& input) const;
      69             :   /// @}
      70             : 
      71             :   /// \brief Interpolate multiple variables on the grid to the target points.
      72           1 :   void interpolate(gsl::not_null<gsl::span<double>*> result,
      73             :                    const gsl::span<const double>& input) const;
      74             : 
      75             :  private:
      76           0 :   friend bool operator==(const Irregular& lhs, const Irregular& rhs) {
      77             :     return lhs.interpolation_matrix_ == rhs.interpolation_matrix_;
      78             :   }
      79           0 :   Matrix interpolation_matrix_;
      80             : };
      81             : 
      82             : template <size_t Dim>
      83             : template <typename TagsList>
      84           0 : void Irregular<Dim>::interpolate(
      85             :     const gsl::not_null<Variables<TagsList>*> result,
      86             :     const Variables<TagsList>& vars) const {
      87             :   if (UNLIKELY(result->number_of_grid_points() !=
      88             :                interpolation_matrix_.rows())) {
      89             :     *result = Variables<TagsList>(interpolation_matrix_.rows(), 0.);
      90             :   }
      91             :   ASSERT(interpolation_matrix_.columns() == vars.number_of_grid_points(),
      92             :          "Number of grid points in source 'vars', "
      93             :              << vars.number_of_grid_points()
      94             :              << ",\n disagrees with the size of the source_mesh, "
      95             :              << interpolation_matrix_.columns()
      96             :              << ", that was passed into the constructor");
      97             :   gsl::span<double> result_span{result->data(), result->size()};
      98             :   const gsl::span<const double> vars_span{vars.data(), vars.size()};
      99             :   interpolate(make_not_null(&result_span), vars_span);
     100             : }
     101             : 
     102             : template <size_t Dim>
     103             : template <typename TagsList>
     104             : Variables<TagsList> Irregular<Dim>::interpolate(
     105             :     const Variables<TagsList>& vars) const {
     106             :   Variables<TagsList> result{interpolation_matrix_.rows()};
     107             :   interpolate(make_not_null(&result), vars);
     108             :   return result;
     109             : }
     110             : 
     111             : template <size_t Dim>
     112           0 : bool operator!=(const Irregular<Dim>& lhs, const Irregular<Dim>& rhs);
     113             : 
     114             : }  // namespace intrp