bugGNU Octave - Bugs: bug #62978, [octave forge] (image) applylut...

 
 

bug #62978: [octave forge] (image) applylut & makelut are not MATLAB compatible

Submitter:  Avinoam Kalma <avinoam>
Submitted:  Mon 29 Aug 2022 03:39:19 PM UTC
 
Category:  Octave Forge Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Matlab Compatibility
Status:  None Assigned to:  None
Originator Name:  Avinoam Open/Closed:  * Open
Release:  * other Operating System:  * Any
Fixed Release:  None Planned Release:  None
* Mandatory Fields

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Sun 25 Sep 2022 08:42:29 AM UTC, comment #1: 

makelut is also not MATLAB compatible:

In Octave:

>> f = @(x) (x(1,1) == 1);
>> lut = makelut (f, 2)'
lut =

   0   0   0   0   0   0   0   0   1   1   1   1   1   1   1   1

while MATLAB result is:

lut =

   0   1   0   1   0   1   0   1   0   1   0   1   0   1   0   1

Though applylut & makelut are compatible with each other.

Avinoam Kalma <avinoam>
Project Member
Mon 29 Aug 2022 03:39:19 PM UTC, original submission:  

While debugging bug #62452, I have seen the next example:

a = [
    0   0   0   0   0   0
   0   0   0   0   0   0
   0   0   0   0   0   0
   0   0   0   0   0   0
   0   0   1   1   0   0
   0   0   0   0   0   0
   0   0   1   0   0   0
   0   0   1   0   0   0
   0   0   0   0   0   0
   0   0   1   0   0   0
   0   0   0   1   0   0
   0   0   0   0   0   0
   0   0   0   1   0   0
   0   0   1   0   0   0
   0   0   0   0   0   0
   0   0   0   0   0   0
];
a = logical(a);
lut2 = false (512, 1);
lut2(19) = true;

applylut (a, lut2)

MATLAB and Octave give different results.

Avinoam Kalma <avinoam>
Project Member

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-09-25 avinoam Summary[octave forge] (image) applylut is not MATLAB compatible [octave forge] (image) applylut & makelut are not MATLAB compatible
    2022-08-29 avinoam Carbon-Copy- Added carandraug
        Carbon-Copy- Added hardy

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