[Octave-bug-tracker] [bug #55059] [octave forge] (image) Failing unit test for grayslice

[Hartmut]

Follow-up Comment #14, bug #55059 (project octave):

Currently all the results of the Octave grayslice function (in the repo) are
Matlab compatible when running my test code from comment #13 (using a vector v
for slicing).

My test code from comment #9 is giving different results on Matlab as on
Octave currently. But I just realised that this difference is only for FLOAT
IMAGES with VALUES BIGGER THAN 1. Because I unintentionally forgot to imcast
the integer input images in these test codes. Currently ALL input images are
of class double (because counter-intuitivly the output value of the intmin
function is of class double).

Conclusion:
* The non-compatible results from my current test code in comment #9 (wich
were Carne's concern in comment #12) are not such a big thing. Because input
images of class double but with most values bigger than 1 are no common use
case anyway. The result is kind of undefined in my opinion.

* I will try to supply Matlab results for more meaningful test codes next
week.

Note: I haven't understood yet, why the one xtest in the current repo version
is failing.

Question: Are all the tests in the function code currently Matlab compatible?
(aka: Do I make things worse if I change the fucntion code and some of the
tests start to fail?)

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