[Octave-bug-tracker] [bug #65424] svds(A) returns singular values in reversed order for complex A

[Rik]

Update of bug #65424 (group octave):

              Item Group:        Incorrect Result => Matlab Compatibility   
                  Status:                    None => Confirmed              
         Originator Name:                Angelika => Angelika i             

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Follow-up Comment #1:

Confirmed.  Changing Item Group to "Matlab Compatibility".

Additional information, svds() can return just the singular values, rather
than the full decomposition.  When only one output is requested, Octave does
return a list sorted in descending order.

Secondly, not all complex matrices are sorted in ascending order.  The example
below (generated with random integers), works.


x = [
   35   19   41   29
   25    4   30   50
   55   49    5   37
   59   47   22    9
];

y = [
   63   53    1   33
   13   38   24   17
   20   54   32   57
   25   17   60   59
];
z = complex (x,y);

[U,S,V] = svds (z)


 


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