fftshift.hpp

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#pragma once
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Types.hpp"
#include "NumCpp/Functions/roll.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc::fft
{
    //===========================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> fftshift(const NdArray<dtype>& inX, Axis inAxis = Axis::NONE)
    {
        STATIC_ASSERT_ARITHMETIC_OR_COMPLEX(dtype);
 
        switch (inAxis)
        {
            case Axis::NONE:
            {
                return roll(inX, inX.size() / 2, inAxis);
            }
            case Axis::COL:
            {
                return roll(inX, inX.numCols() / 2, inAxis);
            }
            case Axis::ROW:
            {
                return roll(inX, inX.numRows() / 2, inAxis);
            }
            default:
            {
                THROW_INVALID_ARGUMENT_ERROR("Unimplemented axis type.");
                return {};
            }
        }
    }
} // namespace nc::fft