[Boost-bugs] [Boost C++ Libraries] #2686: lower/upper triangular matrices are defined and used transposed from math usage

Subject: [Boost-bugs] [Boost C++ Libraries] #2686: lower/upper triangular matrices are defined and used transposed from math usage
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-01-27 02:03:23

#2686: lower/upper triangular matrices are defined and used transposed from math
usage
--------------------------------+-------------------------------------------
 Reporter:  dougrm_at_[hidden]  |       Owner:  matias       
     Type:  Bugs                |      Status:  new          
Milestone:  Boost 1.38.0        |   Component:  Documentation
  Version:  Boost 1.37.0        |    Severity:  Problem      
 Keywords:                      |  
--------------------------------+-------------------------------------------
 The first paragraph of
 http://www.boost.org/doc/libs/1_37_0/libs/numeric/ublas/doc/triangular.htm#triangular_matrix

 describes when elements of lower and upper triangular matrices are fixed
 at 0,  The definition is transposed from what I have always understood to
 define lower/upper triangular.  With the given definition, a lower
 triangular matrix has enforced zeros in the lower triangular portion (when
 i>j).  To me, that is an upper triangular matrix.  Oh, I just looked at a
 little bit of the code and I think it does what the document says -- i.e.,
 the wrong thing.  So, this ticket should apply to numeric/ublas software
 also.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2686>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.