[Octave-bug-tracker] [bug #59568] The signal:buffer() function generates an extra output column in some cases

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?59568>

                 Summary: The signal:buffer() function generates an extra
output column in some cases
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 28 Nov 2020 09:16:06 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Paolo Vicari
        Originator Email: paolo.vicari@katamail.com
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

Dear Octave team,

The buffer() function in package 'signal-1.4.1' gives incorrect results (a
wrongly sized output) with some specific parameter combinations.

The issue seems to be due to a wrong computation of the number of output
columns when the 'overlap' parameter is specified, resulting in an extra
column being output.

I can provide two verified cases of inconsistencies with Matlab R2017a:

buffer((1:16).', 8, 6, 'nodelay') outputs a matrix with 6 columns in Octave,
versus 5 in Matlab R2017a.

buffer((1:16).', 8, 7, 'nodelay') outputs a matrix with 10 columns in Octave,
versus 9 in Matlab R2017a.

The wrongly sized output causes errors in functions which use the buffer()
function to generate data autocorrelation matrices (like Matlab's corrmtx).

Thank you for your support,
Paolo




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