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## [Octave-bug-tracker] [bug #56592] unique() output-dimensions and (first/

 From: Markus Ebner Subject: [Octave-bug-tracker] [bug #56592] unique() output-dimensions and (first/last)-option default incompatible Date: Mon, 8 Jul 2019 13:38:50 -0400 (EDT) User-agent: Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Firefox/60.0

```URL:
<https://savannah.gnu.org/bugs/?56592>

Summary: unique() output-dimensions and (first/last)-option
default incompatible
Project: GNU Octave
Submitted by: seijikun
Submitted on: Mon 08 Jul 2019 05:38:49 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Matlab Compatibility
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 5.1.0
Operating System: GNU/Linux

_______________________________________________________

Details:

The unique() function seems to have an incorrect default value.
The [matlab documentation states
https://uk.mathworks.com/help/matlab/ref/unique.html?searchHighlight=unique&s_tid=doc_srchtitle]:

C = unique(A,occurrence) specifies which indices to return in case of repeated
values. occurrence can be 'first' (default) or 'last'.

The matlab documentation states that "last" is the default.

Further: In Matlab, the second output is a column-vector, while the second
output is a row-vector.

Matlab R2019a:

[a,b] = unique([1,2,3,1])

a =
1     2     3

b =
1
2
3

Octave 5.1.0:

[a,b] = unique([1,2,3,1])

a =
1   2   3

b =
4   2   3

_______________________________________________________

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<https://savannah.gnu.org/bugs/?56592>

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