Re: zp2sos error: cplxpair: could not pair all complex numbers

[Mike Miller]

On Thu, Jan 05, 2017 at 12:30:40 -0500, Nicholas Jankowski wrote:
> > If you can help identify what Matlab does in this situation, and what
> > should be fixed and where, then maybe something can be done about it.
> 
> Running the same script in Matlab 2016b produces no errors and the
> following output.
> Note Octave output from cheby2 is a row vector, Matlab is a column. I
> don't know if this matters.

Yes, that is https://savannah.gnu.org/bugs/?49318

> Matlab output follows. Octave 4.2.0,
> signal pkg v.1.3.2 ouput shown below that.
[…]
>   0.999999629730721 + 0.000860545419704i
>   0.999999629730721 - 0.000860545419704i
[…]
>   0.999999629730722 - 0.000860545419713i
>   0.999999629730722 + 0.000860545419685i

Thanks for running that. So yeah, looks like the bilinear function could
use some improvement here. If this last conjugate pair were correct,
there would be no error in cplxpair.

-- 
mike