desc.basis.PowerSeries

class desc.basis.PowerSeries(L, sym='even')Source

1D basis set for flux surface quantities.

Power series in the radial coordinate.

Parameters:

• L (int) – Maximum radial resolution.

• sym ({"even", False}) – Type of symmetry. “even” has only even powers of rho, for an analytic profile on the disc. False uses the full (odd + even) powers.

Methods

change_resolution(L)	Change resolution of the basis to the given resolution.
copy([deepcopy])	Return a (deep)copy of this object.
equiv(other)	Compare equivalence between DESC objects.
evaluate(nodes[, derivatives, modes, unique])	Evaluate basis functions at specified nodes.
get_idx([L, M, N, error])	Get the index of the 'modes' array corresponding to given mode numbers.
load(load_from[, file_format])	Initialize from file.
save(file_name[, file_format, file_mode])	Save the object.

Attributes

L	Maximum radial resolution.
M	Maximum poloidal resolution.
N	Maximum toroidal resolution.
NFP	Number of field periods.
modes	Mode numbers [l,m,n].
num_modes	Total number of modes in the spectral basis.
spectral_indexing	Type of indexing used for the spectral basis.
sym	{'cos', 'sin', False} Type of symmetry.