Re: [eigen] feature request: implement hybrid matrix class template

[Vincent Hui <vincenthk007@xxxxxxxxx>]

Hi Andre,

What I understand from what Adrien said is that two last optional template parameters can make Matrix a static buffer on stack. I think Hybrid Matrix is better name because it means fix size on stack and dynamic matrix size.

Thanks,

Vincent

On 2 January 2018 at 20:35, Andre Krause <post@xxxxxxxxxxxxxxxx> wrote:

or maybe a different term called "Dynamic_on_stack" to make it clearer ?

without reading the docs, it is not clear that

Matrix<double, Dynamic, Dynamic, 0, 6, 4> M;

is a stack-allocated matrix.



Am 01.01.2018 um 12:08 schrieb Vincent Hui:
> Hi Adrien,
>
> Thanks for your quick reply and great help. I am not aware two last
> optional template parameters. Perhaps it is useful to typedef a type for
> two last optional template parameters to let user use optional
> parameters easily. e.g. HybridMatrix
>
> // Definition of a 3x4 integral row-major matrix with maximum dimensions
> of 6x8
> HybridMatrix<int,6UL,8UL> A( 3UL, 4UL );
>
> Thanks,
> Vincent
>
> On 1 January 2018 at 18:39, Adrien Escande <adrien.escande@xxxxxxxxx
> <mailto:adrien.escande@gmail.com>> wrote:
>
>     Hi Vincent,
>
>     Happy new year as well.
>     This feature is already implemented through the two last optional
>     template parameters of the Matrix class (see
>     http://eigen.tuxfamily.org/dox/group__TutorialMatrixClass.html
>     <http://eigen.tuxfamily.org/dox/group__TutorialMatrixClass.html>).
>     If you want a matrix M with maximum size (6,4) for example, you can
>     write
>     Matrix<double, Dynamic, Dynamic, 0, 6, 4> M;    // 0 specifies a
>     column-major storage
>
>     Cheers,
>     Adrien
>
>     On Mon, Jan 1, 2018 at 6:27 PM, Vincent Hui <vincenthk007@xxxxxxxxx
>     <mailto:vincenthk007@xxxxxxxxx>> wrote:
>
>         Hi,
>
>         Happy new year, In 2018, can hybrid matrix class template
>         <https://bitbucket.org/blaze-lib/blaze/wiki/Matrix%20Types#%21hybridmatrix>

>         be implemented in Eigen? Hybrid matrix class template combines
>         the flexibility of a dynamically sized matrix with the
>         efficiency and performance of a fixed size matrix.
>
>         Thanks,
>         Vincent
>
>
>