[Octave-bug-tracker] [bug #53866] Support for second-order sections in the freqz function

[Renato]

URL:
  <http://savannah.gnu.org/bugs/?53866>

                 Summary: Support for second-order sections in the freqz
function
                 Project: GNU Octave
            Submitted by: yamane
            Submitted on: Tue 08 May 2018 07:57:29 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.0
        Operating System: Any

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Details:

The freqz function in Octave does not yet support a filter specified by sos
(second-order sections), so there is no way to visualize the filter frequency
response.

See item LIMITATIONS on link below:
1) https://www.mathworks.com/help/signal/ref/butter.html

2) https://savannah.gnu.org/bugs/?53855




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