[Octave-bug-tracker] [bug #61750] ismember does not report all matches

[Markus Mützel]

Update of bug #61750 (project octave):

                Category:         Octave Function => Documentation          
              Item Group:        Incorrect Result => Documentation          
        Operating System:       Microsoft Windows => Any                    

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Follow-up Comment #7:

The behavior of `ismember` in MATLAB seems to have changed at some point in
the past (IIUC, for R2013a). See the 'legacy' option in MATLAB:
https://de.mathworks.com/help/matlab/ref/double.ismember.html#btcnv44-14

Octave doesn't have a 'legacy' option. IIUC, it doesn't implement the newer
ordering (so, no need [yet] for a 'legacy' option). But it does implement the
"legacy" ordering correctly.

If I understand this thread correctly, this is a documentation issue. Could
you please suggest wording that better describes the second output argument of
`ismember`?
The docstring currently says (followed by an example):

If a second output argument is requested then the index into s of each
matching element is also returned.


That sounds correct to me: It is kind of an index vector into `s`. But only
for the elements that are matching...
But maybe it can be made easier to understand.

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