Subject: Re: [ublas] GSOC 2013
From: oswin krause (oswin.krause_at_[hidden])
Date: 2013-03-24 08:48:41
HI,
just as another comment:
if we interpret a vector by default as an n x 1 or 1 x n matrix, than either
prod(vector,matrix)
or
prod(matrix,vector)
will fail. That is bad since current vectors don't have an orientation
and an unified prod would require the first call to be a row vector and
the second call to be a column-vector.
On 23.03.2013 22:29, Riccardo Rossi wrote:
> Hi all,
> just to comment that right now matrices are by default
> row-riented as it is normal in c/c++,
> so be careful because if you were to change this default to column
> oriented you would orribly
> affect the performance of all existing applications...
>
> cheers
> Riccardo
>
> On Sat, Mar 23, 2013 at 1:47 PM, David Bellot <david.bellot_at_[hidden]
> <mailto:david.bellot_at_[hidden]>> wrote:
>
> Hi guys,
>
> I proposed a Google Summer of Code project for uBLAS.
> It's based on the wish listthat has been donesome time agoalong
> time ago.
>
> The main ideais to refactor vector into matrix to have only one
> internal and external representation, one set of algorithm. As a
> convenience, the class vector<> will still exist and will, for
> example, beby default a row-vector (like a simple C-array would
> be).Or a column-vector if we prefer but I think matlab is
> row-oriented by default (and I hate R which is column oriented,
> even if I use it every single day at work!!! :-D :-D ah ah ahah!
> Let the flame war begin).
>
> OK, the idea behind this is to have a clean framework to enable
> optimization based on SSE, Neon, multi-core, ... you name it.
> I'm sure the student who will work on that will take inspiration
> from boost::bindings, Eigen, Armadillo, etc...
> The project is very open, so suggestions are most welcome.
>
> Best,
> David
>
>
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>
>
> --
>
> Dr. Riccardo Rossi, Civil Engineer
>
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>
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