How to program Legendre Polynomial for Generalized Spherical Harmonics?

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Benjamin Schuessler 2018-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/417721-how-to-program-legendre-polynomial-for-generalized-spherical-harmonics

编辑： Benjamin Schuessler 2018-9-5

Hi All,

I am looking for some help on how to program/calculate the Legendre polynomial for generalized spherical harmonics.. I have been using the built-in functions legendre and legendreP with great success for some applications, but now with generalized spherical harmonics (Seen below) I need to add an extra term.

I don't know how matlab calculates legendre.m but I want to avoid using syms if possible. As I've been told it might make the calculations incredibly slow.

Any advice or help on how to go about this?

Thanks!

edit: title