#4492: block_matrix reacts inconsistently with 0
--------------------------------------+-------------------------------------
   Reporter:  jbmohler                |       Owner:  was         
       Type:  defect                  |      Status:  needs_review
   Priority:  major                   |   Milestone:  sage-4.6.2  
  Component:  linear algebra          |    Keywords:              
     Author:  Willem Jan Palenstijn   |    Upstream:  N/A         
   Reviewer:  Aly Deines, Rob Beezer  |      Merged:              
Work_issues:  rebase                  |  
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Changes (by rbeezer):

 * cc: davidloeffler (added)


Comment:

 Rebased patches apply fine and Sage builds.

 However 3 doctests fail.  These can be traced to #10433 that snuck into
 4.6.2.alpha1 while this was in-progress.  ;-)  Specifically one 2x2 block
 matrix built at line 2366 of
 `sage/rings/number_field/number_field_ideal.py`

 Latest patch rearranges the block matrix construction to meet new
 requirements for more explicit lists for the block matrix.  I've cc'ed
 David Loeffler if he wants to check off on just that one change.  Passes
 all tests now in sage/rings.  All work here is on 4.6.2.alpha1.

 Would somebody like to retest the whole package now?

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4492#comment:27>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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