conatus.expert.AnnulusBasis

class conatus.expert.AnnulusBasis(coord, size, radii, dealias=REQUIRED)

Bases: _Radial

Radial basis of the annulus r in [ri, ro] (0 < ri): Chebyshev T_n(t), r = c + h t. Equations are discretized in a declared r-multiplied form (r^2 lap, r grad, …).

Parameters:

• coord (Coordinate)

• size (int)

• radii (tuple[float, float])

• dealias (Any)

family = 'annulus radial (Chebyshev T in t, r-multiplied operators)'

fft_length(M)

Length of the FFT that transforms an M-point grid (Fourier: M).

Parameters:

M (int)

Return type:

int

coeff_space()

Return type:

str