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  • $\begingroup$ Thank you, this is excellent. I've made a one-character change to your code that I believe was a typo (at least, everything worked AFTER I made it.) $\endgroup$ Commented Aug 6, 2020 at 23:02
  • $\begingroup$ For searching purposes: this is also sometimes referred to as the "Jury-Marden" criterion. There is also the more classical Schur-Cohn criterion for doing the same test. $\endgroup$ Commented Aug 7, 2020 at 9:12