signal generator

s2fft.utils.signal_generator.generate_flm(rng: Generator, L: int, L_lower: int = 0, spin: int = 0, reality: bool = False, using_torch: bool = False) → ndarray

Generate a 2D set of random harmonic coefficients.

Note

Real signals are explicitly produced from conjugate symmetry.

Parameters:

• rng (Generator) – Random number generator.

• L (int) – Harmonic band-limit.

• L_lower (int, optional) – Harmonic lower bound. Defaults to 0.

• spin (int, optional) – Harmonic spin. Defaults to 0.

• reality (bool, optional) – Reality of signal. Defaults to False.

• using_torch (bool, optional) – Desired frontend functionality. Defaults to False.

Returns:

Random set of spherical harmonic coefficients.

Return type:

np.ndarray

s2fft.utils.signal_generator.generate_flmn(rng: Generator, L: int, N: int = 1, L_lower: int = 0, reality: bool = False, using_torch: bool = False) → ndarray

Generate a 3D set of random Wigner coefficients.

Note

Real signals are explicitly produced from conjugate symmetry.

Parameters:

• rng (Generator) – Random number generator.

• L (int) – Harmonic band-limit.

• N (int, optional) – Number of Fourier coefficients for tangent plane rotations (i.e. directionality). Defaults to 1.

• L_lower (int, optional) – Harmonic lower bound. Defaults to 0.

• reality (bool, optional) – Reality of signal. Defaults to False.

• using_torch (bool, optional) – Desired frontend functionality. Defaults to False.

Returns:

Random set of Wigner coefficients.

Return type:

np.ndarray