Other math functions

factorial function

constexpr uint64_t factorial(int n)

Returns the factorial of an argument. Returns max(uint64_t) if does not fit to uint64_t

Source code

constexpr uint64_t factorial(int n)
{
    if (n < 0 || n > 20)
        return std::numeric_limits<uint64_t>::max();
    return factorial_table[n];
}

https://github.com/kfrlib/kfr/blob//include/kfr/math/gamma.hpp#L88

factorial_approx function

template <typename T1, KFR_ENABLE_IF(is_numeric<T1>)>
flt_type<T1> factorial_approx(const T1 &x)

Returns the approximate factorial of an argument

Source code

template <typename T1, KFR_ENABLE_IF(is_numeric<T1>)>
KFR_FUNCTION flt_type<T1> factorial_approx(const T1& x)
{
    return intrinsics::factorial_approx(x);
}

https://github.com/kfrlib/kfr/blob//include/kfr/math/gamma.hpp#L51

template <typename E1,
          KFR_ENABLE_IF(is_input_expression<E1>)>
internal::expression_function<fn::factorial_approx, E1>
factorial_approx(E1 &&x)

Creates expression that returns the approximate factorial of an argument

Source code

template <typename E1, KFR_ENABLE_IF(is_input_expression<E1>)>
KFR_FUNCTION internal::expression_function<fn::factorial_approx, E1> factorial_approx(E1&& x)
{
    return { fn::factorial_approx(), std::forward<E1>(x) };
}

https://github.com/kfrlib/kfr/blob//include/kfr/math/gamma.hpp#L58

gamma function

template <typename T1, KFR_ENABLE_IF(is_numeric<T1>)>
flt_type<T1> gamma(const T1 &x)

Returns the approximate gamma function of an argument

Source code

template <typename T1, KFR_ENABLE_IF(is_numeric<T1>)>
KFR_FUNCTION flt_type<T1> gamma(const T1& x)
{
    return intrinsics::gamma(x);
}

https://github.com/kfrlib/kfr/blob//include/kfr/math/gamma.hpp#L37

template <typename E1,
          KFR_ENABLE_IF(is_input_expression<E1>)>
internal::expression_function<fn::gamma, E1> gamma(E1 &&x)

Creates expression that returns the approximate gamma function of an argument

Source code

template <typename E1, KFR_ENABLE_IF(is_input_expression<E1>)>
KFR_FUNCTION internal::expression_function<fn::gamma, E1> gamma(E1&& x)
{
    return { fn::gamma(), std::forward<E1>(x) };
}

https://github.com/kfrlib/kfr/blob//include/kfr/math/gamma.hpp#L44

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