[Octave-bug-tracker] [bug #37033] diff / wrong computation of second order differences

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?37033>

                 Summary: diff / wrong computation of second order differences
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 05 Aug 2012 05:25:34 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.2
        Operating System: GNU/Linux

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Details:

Example:


octave:11> A = [1 2 5; 3 4 1]
A =

   1   2   5
   3   4   1

octave:12> diff(A, 1, 2)
ans =

   1   3
   1  -3

octave:13> diff(diff(A, 1, 2), 1, 2)
ans =

   2
  -4

octave:14> diff(A, 2, 2)
ans =

   4
  -2


Commands in lines 13 and 14 should produce the same result.

Attached you can find a patch against octave-3.6.2.

Thank you!



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File Attachments:


-------------------------------------------------------
Date: Sun 05 Aug 2012 05:25:34 PM UTC  Name: mx-inlines.cc.patch  Size: 409B  
By: None

<http://savannah.gnu.org/bugs/download.php?file_id=26322>

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