laguerre.hpp

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#pragma once
 
#include <cmath>
 
#if defined(__cpp_lib_math_special_functions) || !defined(NUMCPP_NO_USE_BOOST)
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Internal/StlAlgorithms.hpp"
#include "NumCpp/NdArray.hpp"
 
#ifndef __cpp_lib_math_special_functions
#include "boost/math/special_functions/laguerre.hpp"
#endif
 
namespace nc::polynomial
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    double laguerre(uint32 n, dtype x)
    {
        STATIC_ASSERT_ARITHMETIC(dtype);
 
#ifdef __cpp_lib_math_special_functions
        return std::laguerre(n, static_cast<double>(x));
#else
        return boost::math::laguerre(n, static_cast<double>(x));
#endif
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    double laguerre(uint32 n, uint32 m, dtype x)
    {
        STATIC_ASSERT_ARITHMETIC(dtype);
 
#ifdef __cpp_lib_math_special_functions
        return std::assoc_laguerre(m, n, static_cast<double>(x));
#else
        return boost::math::laguerre(m, n, static_cast<double>(x));
#endif
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<double> laguerre(uint32 n, const NdArray<dtype>& inArrayX)
    {
        NdArray<double> returnArray(inArrayX.shape());
 
        const auto function = [n](dtype x) -> double { return laguerre(n, x); };
 
        stl_algorithms::transform(inArrayX.cbegin(), inArrayX.cend(), returnArray.begin(), function);
 
        return returnArray;
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<double> laguerre(uint32 n, uint32 m, const NdArray<dtype>& inArrayX)
    {
        NdArray<double> returnArray(inArrayX.shape());
 
        const auto function = [n, m](dtype x) -> double { return laguerre(n, m, x); };
 
        stl_algorithms::transform(inArrayX.cbegin(), inArrayX.cend(), returnArray.begin(), function);
 
        return returnArray;
    }
} // namespace nc::polynomial
 
#endif // #if defined(__cpp_lib_math_special_functions) || !defined(NUMCPP_NO_USE_BOOST)