[Octave-bug-tracker] [bug #49996] zp2sos error: cplxpair: could not pair all complex numbers

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?49996>

                 Summary: zp2sos error: cplxpair: could not pair all complex
numbers
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 06 Jan 2017 02:39:50 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: Hale812
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.0
        Operating System: Microsoft Windows

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Details:

The bug is serious preventing operation of scripts for automated filter
synthesis. Sometimes, optimization code can pass speciffic values, close to
Nyquist frequency, to the cheby2 function. The result is "cplxpair: could not
pair all complex numbers" message and following break of the program.

Either "frequency close to Nyquist" bug should be corrrected completely, or
100% safe frequecy constraints should be specified in manuals.

fpL=0.52915085925565918945068233369966;
fpH=491.55617297547132693580351769924;
[z,p,k]=cheby2(6,40,[fpL.*2 ./1000,fpH.*2 ./1000]);
[sos, g] = zp2sos (z, p, k)





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