From 8197effcf5038bb67c451c794e62343d864ca07a Mon Sep 17 00:00:00 2001 From: Hagen Wierstorf Date: Fri, 23 Oct 2020 08:42:00 +0200 Subject: [PATCH] DOC: note on zeros for spherical Hankel 2nd kind --- SFS_general/sphbesselh_zeros.m | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/SFS_general/sphbesselh_zeros.m b/SFS_general/sphbesselh_zeros.m index bc5ab3e8..6a2213fd 100644 --- a/SFS_general/sphbesselh_zeros.m +++ b/SFS_general/sphbesselh_zeros.m @@ -15,6 +15,12 @@ % Hahn and Spors (2017) and the Python implementation in from scipy in % signal.filter_design._bessel_zeros. % +% The zeros/roots of the spherical Hankel function of the second kind +% can be obtained based on the following relationship: +% Suppose z = x + iy is a zero for the spherical Hankel function +% of the first kind. Then z = -ix + y, and z = -ix -y are zeros +% for the the spherical Hankel function of the second kind. +% % See also: sphbesselh, driving_function_imp_nfchoa % % References: