linear_extrapolation.h

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//
//
/*
    Copyright (C) 2005- 2009, Hammersmith Imanet Ltd
    This file is part of STIR.

    SPDX-License-Identifier: Apache-2.0

    See STIR/LICENSE.txt for details
*/
#include "stir/common.h"
START_NAMESPACE_STIR

template <typename in_elemT>
inline void
linear_extrapolation(std::vector<in_elemT>& input_vector)
{
  input_vector.push_back(*(input_vector.end() - 1) * 2 - *(input_vector.end() - 2));
  input_vector.insert(input_vector.begin(), *input_vector.begin() * 2 - *(input_vector.begin() + 1));
}

END_NAMESPACE_STIR