1)

Does you use this reference to compute Spherical Bessel Functions for real argument?

Accurate recursive generation of spherical Bessel and Neumann functions for a large range of indices

Comput. Phys. 2,
62 (1988); http://dx.doi.org/10.1063/1.168296

2) is there a way to speed up the computation of j_nu(x) if one wants 10 digits accuracy for instance?

Best regards

J.E

2) is there a way to speed up the computation of j_nu(x) if one wants 10 digits accuracy for instance?

Best regards

J.E