mars.tensor.special.hankel1#
- mars.tensor.special.hankel1(v, z, **kwargs)[source]#
Hankel function of the first kind
- Parameters
v (array_like) – Order (float).
z (array_like) – Argument (float or complex).
- Returns
out
- Return type
Values of the Hankel function of the first kind.
Notes
A wrapper for the AMOS 1 routine zbesh, which carries out the computation using the relation,
\[H^{(1)}_v(z) = \frac{2}{\imath\pi} \exp(-\imath \pi v/2) K_v(z \exp(-\imath\pi/2))\]where \(K_v\) is the modified Bessel function of the second kind. For negative orders, the relation
\[H^{(1)}_{-v}(z) = H^{(1)}_v(z) \exp(\imath\pi v)\]is used.
See also
hankel1e
this function with leading exponential behavior stripped off.
References
- 1
Donald E. Amos, “AMOS, A Portable Package for Bessel Functions of a Complex Argument and Nonnegative Order”, http://netlib.org/amos/