def _check_indices(self, inds=None):
"""
Check if the function indices are aligned with the dimensions.
"""
inds = inds or self.indices
return all([aligned_indices(i, j, d.spacing) for i, j, d in
zip(inds, self.indices_ref, self.dimensions)])
def _is_on_grid(self):
"""
Check whether the object is on the grid or need averaging.
For example, if the original non-staggered function is f(x)
then f(x) is on the grid and f(x + h_x/2) is off the grid.
"""
return all([aligned_indices(i, j, d.spacing) for i, j, d in
zip(self.indices, self.indices_ref, self.dimensions)])