Shifting domain

[ego-thales]

Hi,

Is there a simple way to shift the domain of a FData instance? From what I understand, the shift method is meant to shift the curve while looking at the same domain, whereas I would like to shift the curve while looking somewhere else.

I think this could be added in two ways:

• by implementing shift_domain:

def shift_domain(
    self,
    shift: Union[ArrayLike, float],
) -> FDataGrid:
    """Shifts grid points and domain range."""
    shift = np.broadcast_to(shift, self.dim_domain)
    shifted_gp = tuple(gp + s for gp, s in zip(self.grid_points, shift))
    shifted_dr = np.array(self.domain_range) + shift[:, None]
    return self.copy(
        grid_points=shifted_gp,
        domain_range=shifted_dr,
    )

• by redesigning a bit the shift method, which may not help its clarity of use. By the way, I think the grid_points option is a bit misleading, since the argument is meant to be points inside the domain_range, that will be shifted with shifts before evaluation.

Cheers!