[bug #68196] [octave forge] (control) Wrong phase in bode plot

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Follow-up Comment #6, bug #68196 (group octave):

That works too, though I would add some tolerance:

 n_poles_at_origin = sum (abs (all_poles{h} - pole_zero) < tol);
    n_zeros_at_origin = sum (abs (all_zeros{h} - pole_zero) < tol);


Not quite sure what is `tol` should be `eps` or `sqrt(eps)`.
(`eps` is probably still too strict)

Dmitri.
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