[Scipy-tickets] [SciPy] #1717: QZ segfault on Windows for 0.11.0rc1

SciPy Trac scipy-tickets@scipy....
Tue Aug 7 18:29:44 CDT 2012


#1717: QZ segfault on Windows for 0.11.0rc1
--------------------------+-------------------------------------------------
 Reporter:  rgommers      |       Owner:  somebody
     Type:  defect        |      Status:  new     
 Priority:  highest       |   Milestone:  0.11.0  
Component:  scipy.linalg  |     Version:  devel   
 Keywords:                |  
--------------------------+-------------------------------------------------

Comment(by jseabold):

 Or I guess it could be a compiler issue? The only change I see since 3.1.1
 that effects dgges is revision 735 in lapack, though I don't think it
 affects the sort. In fact, it seems to indicate that a change in a
 subroutine after 3.1.1 led to unexpected behavior.

 http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=2&t=1783

 "We have changed xLARFG to xLARFP in xGEQR2. xGEQR2 is used by xDGGES. The
       matrices are therefore different (although all of them are correct.)
 However
       for the matrix generated by xLARFP, xTGEX2 exceeds the THRES value
 by 10%,
       causing an error flag. We decided to increase THRES by a factor of
 2.
       Although the bug was triggered by the change from xLARFG to xLARFP,
 XLARFP
       is not really at guilt."

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1717#comment:8>
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