torus_solver.spectral

torus_solver.spectral.make_wavenumbers(n, period=6.283185307179586)

Return Fourier wavenumbers (rad⁻¹) for a periodic grid of length period.

Return type:

Array

Parameters:

• n (int)

• period (float)

torus_solver.spectral.spectral_derivative(f, k, *, axis)

Compute ∂f/∂x for a periodic coordinate using FFTs.

Return type:

Array

Parameters:

• f (Array)

• k (Array)

• axis (int)

torus_solver.spectral.spectral_second_derivative(f, k, *, axis)

Compute ∂²f/∂x² for a periodic coordinate using FFTs.

Return type:

Array

Parameters:

• f (Array)

• k (Array)

• axis (int)