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DOC: note on zeros for spherical Hankel 2nd kind #196

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DOC: note on zeros for spherical Hankel 2nd kind #196

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6 changes: 6 additions & 0 deletions SFS_general/sphbesselh_zeros.m
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Expand Up @@ -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:
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