Calculates the derivative coefficients at grid points.

Parameters¶

inds: numpy.ndarray

The integer grid point indices, shape: (n_inds, n_dims)

var: int

The dimension representing the variable wrt which to differentiate

order: int

The finite difference order, 1 = forward, -1 = backward, 2 = centre

orderb: int

The finite difference order at boundary points

Returns¶

gpts: numpy.ndarray

The grid points relevant for coeffs, shape: (n_gpts, n_dims)

coeffs: numpy.ndarray

The gradient coefficients, shape: (n_inds, n_gpts)