autocorr.hpp

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#pragma once
 
// import numpy as np
#include <utility>
#include <vector>
 
#include "matrix2.hpp"
#include "rootfinding.hpp"
#include "vector2.hpp"
 
extern auto initial_autocorr(const std::vector<double>& coeffs) -> std::vector<Vec2>;
 
extern auto pbairstow_autocorr_st(const std::vector<double>& coeffs, std::vector<Vec2>& vrs,
                                  const Options& options) -> std::pair<unsigned int, bool>;
 
extern auto pbairstow_autocorr_mt(const std::vector<double>& coeffs, std::vector<Vec2>& vrs,
                                  const Options& options) -> std::pair<unsigned int, bool>;
 
inline auto pbairstow_autocorr(const std::vector<double>& coeffs, std::vector<Vec2>& vrs,
                               const Options& options) -> std::pair<unsigned int, bool> {
    return pbairstow_autocorr_st(coeffs, vrs, options);
}
 
extern void extract_autocorr(Vec2& vr);
 
extern auto poly_from_autocorr_factors(const std::vector<Vec2>& vrs) -> std::vector<double>;