arctan2.hpp

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#pragma once
 
#include <cmath>
#include <string>
 
#include "NumCpp/Core/Internal/Error.hpp"
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Internal/StlAlgorithms.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    auto arctan2(dtype inY, dtype inX) noexcept
    {
        STATIC_ASSERT_ARITHMETIC(dtype);
 
        return std::atan2(inY, inX);
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    auto arctan2(const NdArray<dtype>& inY, const NdArray<dtype>& inX)
    {
        if (inX.shape() != inY.shape())
        {
            THROW_INVALID_ARGUMENT_ERROR("input array shapes are not consistant.");
        }
 
        NdArray<decltype(arctan2(dtype{ 0 }, dtype{ 0 }))> returnArray(inY.shape());
        stl_algorithms::transform(inY.cbegin(),
                                  inY.cend(),
                                  inX.cbegin(),
                                  returnArray.begin(),
                                  [](dtype y, dtype x) noexcept -> auto { return arctan2(y, x); });
 
        return returnArray;
    }
} // namespace nc