[Octave-bug-tracker] [bug #45685] union.m for mixed inputs and when one is empty

[Juan Pablo Carbajal]

URL:
  <http://savannah.gnu.org/bugs/?45685>

                 Summary: union.m for mixed inputs and when one is empty
                 Project: GNU Octave
            Submitted by: juanpi
            Submitted on: Mon 03 Aug 2015 09:20:26 PM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: juanpi
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:


In matlab


>> union({}, [])

ans = 

   Empty cell array: 0-by-1

>> union([], {})

ans = 

   Empty cell array: 0-by-1

union([], {'a', 'b'})

ans = 

    'a'
    'b'

(this is a 2 x 1 cell array containing 'a', and 'b')


>> union(['a', 'b'], {})

ans = 

    'ab'

(this is a 1 x 1 cell array containing the string 'ab')


This is not the case for Octave

The attached patch fixes this for union, setdiff and setxor.

However


intersect (['a', 'b'], {})
intersect ([], {'a', 'b'})
intersect ([], {})


Return the empty array in Octave but the empty cell array (probably 0x1) in
matlab.





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