[Octave-bug-tracker] [bug #30128] sort with trailing singleton dimensions

[Jaroslav Hajek]

URL:
  <http://savannah.gnu.org/bugs/?30128>

                 Summary: sort with trailing singleton dimensions
                 Project: GNU Octave
            Submitted by: highegg
            Submitted on: Mon 14 Jun 2010 12:59:54 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: highegg
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Since at least 3.2.x, sort() refuses to sort along a trailing singleton
dimension (which are auto-chopped):

octave:1> sort (rand (3), 3)
error: sort: dim must be a valid dimension

I believe this is wrong, though; other reductions don't behave this way
(except nth_element, where I copied it from sort), i.e. they reinvent the
trailing dimensions as you need them (as if any array had an infinite number
of dimensions).

Without this, you'd need to special case trailing singleton dims in basically
any user function taking a "dim" argument.

Can someone check this in some recent Matlab? I already pushed the change
upstream, but now the build fails regression tests. Although common sense
speaks for the change, I would like to see it verified before changing any
tests.




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