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//
// Copyright 2016 Ettus Research
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef INCLUDED_UHD_INTERPOLATION_HPP
#define INCLUDED_UHD_INTERPOLATION_HPP
#include <uhd/exception.hpp>
#include <boost/format.hpp>
#include <map>
#include <cmath>
namespace uhd {
namespace cal {
template<typename in_type, typename out_type>
struct interp
{
public:
typedef std::vector<in_type> args_t;
typedef std::map<args_t, out_type> container_t;
/*!
* Nearest neighbor interpolation given a mapping: R^n -> R
*
* 1) search for the nearest point in R^n
* 2) find the nearest output scalars in R
*
* \param data input data container
* \param args input data point
* \returns interpolated output value
*/
const out_type nn_interp(container_t &data, const args_t &args);
/*!
* Bilinear interpolation given a mapping: R^2 -> R
*
* 1) search for 4 surrounding points in R^2
* 2) find the output scalars in R
* 3) solve the system of equations given our input mappings
*
* \param data input data container
* \param args input data point
* \returns interpolated output value
*/
const out_type bl_interp(container_t &data, const args_t &args);
private:
/*!
* Calculate the distance between two points
*/
static in_type calc_dist(const args_t &a, const args_t &b);
};
} // namespace cal
} // namespace uhd
#endif /* INCLUDED_UHD_INTERPOLATION_HPP */
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