[Octave-bug-tracker] [bug #30114] perms generates different results to matlab

[Qianqian Fang]

URL:
  <http://savannah.gnu.org/bugs/?30114>

                 Summary: perms generates different results to matlab
                 Project: GNU Octave
            Submitted by: fangq
            Submitted on: Fri 11 Jun 2010 03:07:54 PM GMT
                Category: Libraries
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Qianqian Fang
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

basically, the orders of the rows are different, this had caused some
inconsistent results for a script I have been working on.

to test, try perms(1:4) and perms([2 1 4 3]) in octave and matlab. 

In general, the first column of matlab's output is the slowest index, moving
by the order from the end of the input vector to the front. While, octave's is
a bit reversed, and more random.

The algorithm in perms.m should be rewrite in order to match the output
orders.




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