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Has anyone implementated a Discrete Spherical Harmonic Transform?

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I am wondering if anyone has implemented a fast spherical harmonic transform and its inverse in Mathematica? In particular for the two-dimensional sphere.The spherical harmonic transform appears to combine an FFT and a discrete Legendre transform. So, if there is a discrete Legendre transform implementation in Mathematica, that would be useful.As a last resort, there are implementations in C that I could probably port with MathLink.
POSTED BY: W. Craig Carter
Answer
5 months ago