Is function Unique described correctly in the documentation

I ran a example of Unique given in the online 2013a documentations

A = [9 2 9 5]; [C, ia, ic] = unique(A)

The results given in the documentation is as follows: C =

     2     5     9

ia =

     2
     4
     1

ic =

     3
     1
     3
     2

But i got the different results for ia from my Matlab 2011a as follows ia =

     2     4     3

Is the description in the documentation is correct or is it a bug in the code?

Answer 1

[the cyclist]

There were changes in the methodology between those two versions of MATLAB. The 2013a documentation will definitely not accurately describe the 2011a behavior.

Type

doc unique

in your version to see the appropriate documentation for that version.

[Min]

Thanks. The default in 2011a is 'last'. I should use 'first'.

Answer 2

[Shashank Prasanna]

There are compatibility considerations for the UNIQUE function detailed here in the release notes:

http://www.mathworks.com/help/matlab/release-notes.html?searchHighlight=unique

Please make sure you read the relevant version's documentation as the cyclist mentioned.