[Numpy-discussion] NaN (Not a Number) occurs in calculation of complex number for Bessel functions

Pauli Virtanen pav at iki.fi
Fri Dec 21 07:46:26 EST 2012

Happyman <bahtiyor_zohidov <at> mail.ru> writes:
> IF I GIVE ( it is necessary value for my program ): 
> a , b = sph_jn ( 536 , 2513.2741228718346 + 201.0619298974676j )

The implementation of the spherical Bessel functions is through
this Fortran code:


It does not have asymptotic expansions for dealing with parts of
the complex plane where the computation via the recurrence does not

Pauli Virtanen

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