[Octave-bug-tracker] [bug #34800] mldivide(sparse, ...) returns NULL in least-squares case

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?34800>

                 Summary: mldivide(sparse, ...) returns NULL in least-squares
case
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 11 Nov 2011 11:00:21 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Alex Suykov
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.3
        Operating System: GNU/Linux

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Details:

Found this while trying to run SeDuMi 1.3 in Octave. I can't check it against
Matlab, but it certainly doesn't look right.

Simple test file attached. Expected result is xs = xm = [ 1.5; 0; 0 ]. Actual
result is xs = [](0x0), while xm gets the correct value. This is Example 3
from http://www.mathworks.com/help/techdoc/ref/mldivide.html .

mrdivide is affected as well.



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File Attachments:


-------------------------------------------------------
Date: Fri 11 Nov 2011 11:00:21 AM UTC  Name: mldivide-sparse-err.m  Size: 130B
  By: None

<http://savannah.gnu.org/bugs/download.php?file_id=24351>

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