Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7549: uBLAS banded storage does not match common BLAS layout (from netlib)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-10-21 20:54:35
#7549: uBLAS banded storage does not match common BLAS layout (from netlib)
-------------------------------+--------------------------------------------
Reporter: guwi17 | Owner: guwi17
Type: Bugs | Status: new
Milestone: To Be Determined | Component: uBLAS
Version: Boost 1.52.0 | Severity: Problem
Resolution: | Keywords: ublas banded matrix layout
-------------------------------+--------------------------------------------
Comment (by guwi17):
The responsible code is in `banded.hpp` around line 163. The mapping from
index (i,j) to storage location is
{{{
const size_type k = j;
const size_type l = upper_ + i - j;
if (k < size2_ && l < lower_ + 1 + upper_)
return data () [layout_type::element (k, size2_, l, lower_ + 1 +
upper_)];
}}}
where `layout_type` is either `basic_row_major` or `basic_column_major`
(from `functional.hpp`)
We should extract the existing mapping logic to a functor (similar to
triangular types `basic_lower` and `basic_upper`) and introduce a new
template argument.
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/7549#comment:3> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
This archive was generated by hypermail 2.1.7 : 2017-02-16 18:50:10 UTC