Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4034: better vector/matrix assignment (or initialization)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-04-10 10:41:45
#4034: better vector/matrix assignment (or initialization)
------------------------------+---------------------------------------------
Reporter: guwi17 | Owner: guwi17
Type: Patches | Status: new
Milestone: To Be Determined | Component: uBLAS
Version: Boost 1.42.0 | Severity: Optimization
Keywords: assigment |
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Comment(by cassioliandre@â¦):
Hi guys, I found the overall discussion very stimulating.
Using uBlas can be quite annoying for the lack of such assignement
operators that in my experience (i'm working on the optimization and fem
simulation field).
I was wondering if it not might be the case to take a look to the
Boost::Assign library and see if it can be extended and adapted to work
with uBlas. For naive assignament it already provides operator+= and
similar that could be useful to simply fill vectors. For a matrix, a
machinery similar to the one in place for map could be used.
In this way uBlas could be used more freely besides for instance a
std::vector, for which Boost::Assign already works.
For what concern how to rule the access if by rows or columns, I suggest
to possibilities:
* do not allow free access but force user to specify the column or row
access explicitly, as for instance as
{{{
#!C
boost::numeric::ublas::matrix<double> m(10,10);
m += row(2, a_vector_of_values ), row(1, another_list_of_values);
}}}
* an std::stream modificator like syntax might be used:
{{{
#!C
boost::numeric::ublas::matrix<double> m(10,10);
m << row(1)<< 0, 1, 2,3<< row(2)<< 4,5,6,7;
}}}
Best Regards, Andrea
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/4034#comment:2> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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