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[Octave-bug-tracker] [bug #53897] poly of conjugate complex pairs should

From: Robert Jenssen
Subject: [Octave-bug-tracker] [bug #53897] poly of conjugate complex pairs should return a real polynomial
Date: Tue, 5 Mar 2019 20:17:06 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

Follow-up Comment #13, bug #53897 (project octave):

This patch fails for zp2tf from the signal package with values that are
"nearly" real. Copying from line 84 of

octave:14> [z1,p1,k1]=cheby2(5,40,0.1);
octave:15> p1
p1 =
   9.345539872652292e-01 - 1.826618879469199e-01i
   8.372613608092301e-01 - 1.304057652412007e-01i
   7.781404349401341e-01 - 1.537554717468438e-17i
   8.372613608092301e-01 + 1.304057652412007e-01i
   9.345539872652292e-01 + 1.826618879469199e-01i

octave:16> tmp = sort (p1(imag (p1) > 0)) == sort (conj (p1(imag (p1) < 0)))
error: mx_el_eq: nonconformant arguments (op1 is 2x1, op2 is 3x1)


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