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Add Bessel functions to SpecialFunctions.

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- Split SpecialFunctions files in to a separate BesselFunctions file.

In particular add:
    - Modified bessel functions of the second kind k0, k1, k0e, k1e
    - Bessel functions of the first kind j0, j1
    - Bessel functions of the second kind y0, y1
This commit is contained in:
Srinivas Vasudevan
2019-09-14 12:16:47 -04:00
parent facdec5aa7
commit 6e215cf109
23 changed files with 3427 additions and 548 deletions
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45
unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsArrayAPI.h
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@@ -161,51 +161,6 @@ zeta(const Eigen::ArrayBase<DerivedX>& x, const Eigen::ArrayBase<DerivedQ>& q)
);
}
/** \returns an expression of the coefficient-wise i0e(\a x) to the given
* arrays.
*
* It returns the exponentially scaled modified Bessel
* function of order zero.
*
* \param x is the argument
*
* \note This function supports only float and double scalar types. To support
* other scalar types, the user has to provide implementations of i0e(T) for
* any scalar type T to be supported.
*
* \sa ArrayBase::i0e()
*/
template <typename Derived>
EIGEN_STRONG_INLINE const Eigen::CwiseUnaryOp<
Eigen::internal::scalar_i0e_op<typename Derived::Scalar>, const Derived>
i0e(const Eigen::ArrayBase<Derived>& x) {
return Eigen::CwiseUnaryOp<
Eigen::internal::scalar_i0e_op<typename Derived::Scalar>,
const Derived>(x.derived());
}
/** \returns an expression of the coefficient-wise i1e(\a x) to the given
* arrays.
*
* It returns the exponentially scaled modified Bessel
* function of order one.
*
* \param x is the argument
*
* \note This function supports only float and double scalar types. To support
* other scalar types, the user has to provide implementations of i1e(T) for
* any scalar type T to be supported.
*
* \sa ArrayBase::i1e()
*/
template <typename Derived>
EIGEN_STRONG_INLINE const Eigen::CwiseUnaryOp<
Eigen::internal::scalar_i1e_op<typename Derived::Scalar>, const Derived>
i1e(const Eigen::ArrayBase<Derived>& x) {
return Eigen::CwiseUnaryOp<
Eigen::internal::scalar_i1e_op<typename Derived::Scalar>,
const Derived>(x.derived());
}
} // end namespace Eigen