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Implementation of Discrete Spherical Harmonic Transforms with Mathematica?
Hello, 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. I am posting this question on the wolfram community site as well. W Craig Carter