[bug #68121] plea to make isequal built-in

Please use the bug tracker to post updates to a bug report.  The mailing list is intended as a read-only notification stream.  Info posted to this mailing list address won't appear in the tracker database where it is most useful.

URL:
  <https://savannah.gnu.org/bugs/?68121>

                 Summary: plea to make isequal built-in
                   Group: GNU Octave
               Submitter: afpotvin
               Submitted: Thu 05 Mar 2026 04:20:28 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: Andy Potvin
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Unlocked
                 Release: 10.3.0
        Operating System: Any
           Fixed Release: None
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Thu 05 Mar 2026 04:20:28 PM UTC By: Andy Potvin <afpotvin>
As the subject says, I ask that isequal be built-in; it should be MUCH faster
than M/Octave code.  Note: MATLAB's isequal is built-in.

I am used to Octave being 2-3 times slower and can live with that.  But I've
got an application that heavily leans on isequal [fn1] and my code is running
~19-20 times slower on Octave compared to MATLAB.

Perhaps you will tell me my request has already been implemented in a later
version (I'm currently using 10.3.0).  ;-)

Thank you for your attention to this matter.

Andy

[fn1] About my application.
I am working with sudoku puzzles.  As I generate puzzles, I first want to make
sure I haven't used the puzzle (answer) before.  So I'm calling isequal
against my current database of prior puzzles.  That would be bad enough, but
sudoku puzzles have "isomorphs"; i.e.  two puzzles are essentially the same if
e.g. transposing or fliplr or fliprl or permuting digits.  For a standards 9x9
sudoku puzzle, there are 648 isomorphs.  Thus, I actually have to do 648
isequal against every previous puzzle.










    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?68121>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/

-----BEGIN PGP SIGNATURE-----

iHUEABYIAB0WIQQk97aszIMMAvLLwm6qLAuaBUf3TgUCaamtUAAKCRCqLAuaBUf3
TombAQCQ81Md0xnUV4glS8pMzMDCRA1b67JKZWY8XVKLg149bQEAxK2mSrmvkGYw
clBgAWGdB6qlCDxj1E0nHEV5BCWTWgQ=
=kT18
-----END PGP SIGNATURE-----