bugGNU Octave - Bugs: bug #59953, [octave forge] (image) imtransform...


bug #59953: [octave forge] (image) imtransform xdata can't handle descending order

Submitted by:  None
Submitted on:  Wed 27 Jan 2021 09:30:55 AM UTC  
Category:  Octave Forge Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  Confirmed Assigned to:  None
Originator Name:  Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  other
Operating System:  GNU/Linux

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Sun 31 Jan 2021 09:27:27 PM UTC, comment #2: 

Dear Anonymous, thank you for letting us know about this bug you found in Octave's image package.

Our image package is maintained by (very) few volunteers who donate their spare time to keep it up and running as well as improving it. I hope that one of us can have a closer look at this issue in the near future. But much to my regret, it often takes an unpleasantly long time before this happens.

If you are familiar with writing and debugging m-files, like our imtransform.m, then you could really help us to fix the bug you found by investigating yourself and trying to pin-point where and how our m-code should be improved. We would be really grateful for any contribution of yours to make the image package even better.

Hartmut <hardy>
Thu 28 Jan 2021 07:27:34 PM UTC, comment #1: 

adding people to cc

Hartmut <hardy>
Wed 27 Jan 2021 09:30:55 AM UTC, original submission:  

im = [1 2;3 4];
tmat = [eye(2); 0 0];
T = maketform ('affine', tmat);
im2 = imtransform (im, T, 'xdata', [3 1], 'ydata', [1 3]);

This code would result in [0 2 1; 0 4 3; 0 0 0] in Matlab but a 3x0 matrix in Octave.



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  • -email is unavailable- added by avinoam (Updated the item)
  • -email is unavailable- added by siko1056 (Updated the item)
  • -email is unavailable- added by hardy (Posted a comment)
  • -email is unavailable- added by hardy
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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-01-31 avinoam StatusNone => Confirmed
        Release5.2.0 => other
    2021-01-31 siko1056 Summaryimage package: imtransform xdata can't handle descending order => [octave forge] (image) imtransform xdata can't handle descending order
    2021-01-28 hardy Carbon-Copy- => Added avinoam
        Carbon-Copy- => Added carandraug

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