get_fieldline_npoints

get_fieldline_npoints(traces)

Count the number of valid (non-NaN) points in each fieldline.

Parameters:

tracesTraces | ndarray

A Traces object or a 3D array of shape (M, 3, N), where NaNs indicate unused portions of the buffer.

Returns:

npointsndarray of int

An array of shape (N,) indicating the number of valid points in each of the N fieldlines.