scipy.special.hankel2e

scipy.special.hankel2e(v, z) = <ufunc 'hankel2e'>

Exponentially scaled Hankel function of the second kind

Defined as:

hankel2e(v, z) = hankel2(v, z) * exp(1j * z)

Parameters:

v : array_like

Order (float).

z : array_like

Argument (float or complex).

Returns:

out : Values of the exponentially scaled Hankel function of the second kind.

Notes

A wrapper for the AMOS [R438] routine zbesh, which carries out the computation using the relation,

$$H^{(2)}_v(z) = -\frac{2}{\imath\pi} \exp(\frac{\imath \pi v}{2}) K_v(z exp(\frac{\imath\pi}{2}))$$

where $K_v$ is the modified Bessel function of the second kind. For negative orders, the relation

$$H^{(2)}_{-v}(z) = H^{(2)}_v(z) \exp(-\imath\pi v)$$

is used.

References

[R438]

(1, 2) Donald E. Amos, “AMOS, A Portable Package for Bessel Functions of a Complex Argument and Nonnegative Order”, http://netlib.org/amos/