piecewise_linear_1D.h

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#ifndef CHITECH_CHI_MATH_FUNCTIONS_PIECEWISELINEAR1D_H
#define CHITECH_CHI_MATH_FUNCTIONS_PIECEWISELINEAR1D_H
 
#include "function_dimA_to_dimB.h"
 
namespace chi_math::functions
{
class PiecewiseLinear1D : public FunctionDimAToDimB
{
public:
  static chi::InputParameters GetInputParameters();
 
  explicit PiecewiseLinear1D(const chi::InputParameters& params);
 
  std::vector<double>
  Evaluate(const std::vector<double>& values) const override;
  std::vector<double>
  EvaluateSlope(const std::vector<double>& values) const override;
 
  double ScalarFunction1Parameter(double x) const override;
  double ScalarFunctionSlope1Parameter(double x) const override;
 
  bool HasSlope() const override {return true;}
  bool HasCurvature() const override {return false;}
private:
  // Inputs
  /**Independent variable values.*/
  const std::vector<double> x_values_;
  /**Dependent variable values.*/
  const std::vector<double> y_values_;
 
  std::vector<double> slopes_;
 
  // Determined during construction
  /**The number of items in the discrete function values*/
  const size_t num_vals_;
  /**Distance between independent variable values. Used for interpolation.*/
  std::vector<double> delta_x_values_;
};
} // namespace chi_math::functions
 
#endif // CHITECH_CHI_MATH_FUNCTIONS_PIECEWISELINEAR1D_H