bugGNU Octave - Bugs: bug #61787, wrong output of "isreal"...


bug #61787: wrong output of "isreal" on array of uint8

Submitted by:  Hartmut <hardy>
Submitted on:  Mon 10 Jan 2022 05:17:23 PM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * 7.0.90 Operating System:  * Any
* Mandatory Fields

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Tue 11 Jan 2022 04:20:58 PM UTC, comment #2: 

Good catch Hartmut.  I checked in jwe's patch under his name with a commit message here: http://hg.savannah.gnu.org/hgweb/octave/rev/579a21f74d6d

Marking as fixed and closing report.

Rik <rik5>
Project Administrator
Mon 10 Jan 2022 06:22:04 PM UTC, comment #1: 

I think the attached change should fix it.

(file #52638)

John W. Eaton <jwe>
Project Administrator
Mon 10 Jan 2022 05:17:23 PM UTC, original submission:  

Here is a regression (I think) that I observered with the current release candidate 7.0.90 under Win10, but I assume it is there under all OS'es. To demonstrate the principle, run the following code:


  • This gives 0 under Octave 7.0.90
  • This gives 1 under Octave 6.4.0
  • This gives 1 under Matlab R2019b

I think the current result of Octave 7.0.90 is wrong. Maybe the underlying regression in Octave 7 is much wider than just the "isreal" function, I cannot judge this.

This error does not happen if you just do "isreal(5:9)" with double input arrays.

I found this, because a unit test in the image package was failing.

Hartmut <hardy>


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Attach Files:

Attached Files
file #52638:  range-isreal-diffs.txt added by jwe (378B - text/plain)


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-01-11 rik5 StatusNone => Fixed
        Open/ClosedOpen => Closed
    2022-01-10 jwe Attached File- => Added range-isreal-diffs.txt, #52638

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