bugGNU Octave - Bugs: bug #59807, quadgk results of v.6 different...

 
 

bug #59807: quadgk results of v.6 different from results of v.5 (correct ones as checked with MATLAB)

Submitter:  None
Submitted:  Sun 03 Jan 2021 10:06:02 AM UTC
   
 
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Need Info Assigned to:  None
Originator Name:  d.v.vougas Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 6.1.0
Operating System:  * Microsoft Windows Fixed Release:  None
Planned Release:  None
* Mandatory Fields

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Mon 11 Jan 2021 09:43:13 AM UTC, comment #3: 

No example showing the error was supplied during more than a week.

Closing report.

If someone could show an example for which quadgk is failing now, we could investigate further (and re-open this report).

Markus Mützel <mmuetzel>
Group administrator
Mon 04 Jan 2021 04:40:43 PM UTC, comment #2: 

From the NEWS file for the 6.1 release


- Numerical integration has been improved.  The `quadv` function has
  been re-written so that it can compute integrands of periodic
  functions.  At the same time, performance is better with ~3.5X fewer
  function evaluations required.  A bug in `quadgk` that caused complex
  path integrals specified with `"Waypoints"` to occasionally be
  calculated in the opposite direction was fixed.


We need some examples to ascertain whether the differences between v5 and v6 might be related to the use of "Waypoints".

Rik <rik5>
Group administrator
Sun 03 Jan 2021 11:00:33 AM UTC, comment #1: 

Could you give any example?

Markus Mützel <mmuetzel>
Group administrator
Sun 03 Jan 2021 10:06:02 AM UTC, original submission:  

I checked some results of quadgk in v.6 for windows w64bit and they are different from the corresponding results of v.5 that they are correct anyway (checked with MATLAB).

Anonymous

 

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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-01-11 mmuetzel Open/ClosedOpen Closed
    2021-01-06 mmuetzel Carbon-CopyRemoved 102357 -
    2021-01-04 rik5 SummaryResults of v.6 different from results of v.5 (correct ones as checked with MATLAB) quadgk results of v.6 different from results of v.5 (correct ones as checked with MATLAB)
    2021-01-03 mmuetzel Item GroupNone Incorrect Result
        StatusNone Need Info

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