T3Frame.orthogonality_residual

t3toolbox.frame_variations_format.T3Frame.orthogonality_residual()

def orthogonality_residual(self) -> NDArray:  # shape = stack_shape (scalar/0-d when unstacked)

Max absolute deviation of the orthogonal cores from identity, per stack element (shape stack_shape; atol-independent; cached).

The expensive part of is_orthogonal() – a fixed frame reused across an inner loop (e.g. the safe-mode ORTH precondition of project() on the same frame every matvec) is contracted once, not per call.

Return type:

NDArray