expm1.hpp

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#pragma once
 
#include <cmath>
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Internal/StlAlgorithms.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    auto expm1(dtype inValue) noexcept
    {
        STATIC_ASSERT_ARITHMETIC_OR_COMPLEX(dtype);
 
        return std::exp(inValue) - dtype{ 1 };
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    auto expm1(const NdArray<dtype>& inArray)
    {
        NdArray<decltype(expm1(dtype{ 0 }))> returnArray(inArray.shape());
 
        stl_algorithms::transform(inArray.cbegin(),
                                  inArray.cend(),
                                  returnArray.begin(),
                                  [](dtype inValue) noexcept -> auto { return expm1(inValue); });
 
        return returnArray;
    }
} // namespace nc