[Octave-bug-tracker] [bug #36904] function rank throws exception on non square matrices

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?36904>

                 Summary: function rank throws exception on non square
matrices
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 20 Jul 2012 04:03:50 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: rnestler
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.2
        Operating System: GNU/Linux

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Details:

When using the function rank on non square matrix the following error gets
thrown:


octave:20> rank([1 2 3], [0 0 0])
 ** On entry to DORGLQ parameter number  5 had an illegal value
error: svd: exception encountered in Fortran subroutine dgesvd_
error: called from:
error:   /usr/share/octave/3.6.2/m/linear-algebra/rank.m at line 52, column
11


This also happens for example with rank([1 2 3]) or rank([1,0,0]
).
Using the same in matlab gives the correct result '1'

It probably has something to do with the fact that rank needs the singular
values to calculate the rank, which can only be calculated for square
matrices.




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