desc.grid.Grid

class desc.grid.Grid(nodes, sort=True)

Base class for collocation grids.

Unlike subclasses LinearGrid and ConcentricGrid, the base Grid allows the user to pass in a custom set of collocation nodes.

Parameters:

• nodes (ndarray of float, size(num_nodes,3)) – node coordinates, in (rho,theta,zeta)

• sort (bool) – whether to sort the nodes for use with FFT method.

Methods

copy([deepcopy])	Return a (deep)copy of this object.
eq(other)	Compare equivalence between DESC objects.
load(load_from[, file_format])	Initialize from file.
save(file_name[, file_format, file_mode])	Save the object.

Attributes

L	Radial grid resolution.
M	Poloidal grid resolution.
N	Toroidal grid resolution.
NFP	Number of (toroidal) field periods.
axis	Indices of nodes at magnetic axis.
inverse_rho_idx	Indices of unique_rho_idx that recover the rho coordinates.
inverse_theta_idx	Indices of unique_theta_idx that recover the theta coordinates.
inverse_zeta_idx	Indices of unique_zeta_idx that recover the zeta coordinates.
node_pattern	Pattern for placement of nodes in (rho,theta,zeta).
nodes	Node coordinates, in (rho,theta,zeta).
num_nodes	Total number of nodes.
num_rho	Number of unique rho coordinates.
num_theta	Number of unique theta coordinates.
num_zeta	Number of unique zeta coordinates.
spacing	Node spacing, in (rho,theta,zeta).
sym	True for stellarator symmetry, False otherwise.
unique_rho_idx	Indices of unique rho coordinates.
unique_theta_idx	Indices of unique theta coordinates.
unique_zeta_idx	Indices of unique zeta coordinates.
weights	Weight for each node, either exact quadrature or volume based.