matrix
CresitelloDittmar, Mark
mdittmar at cfa.harvard.edu
Fri Apr 3 16:58:11 CEST 2020
Ah, I see..
You're suggesting we need to support MxNxP matrices (or more).
I think an earlier version of the model had an abstract Matrix, with
Matrix2D.. we could go back to that, allowing for Matrix3D, etc extensions.
Or forgo the abstract head and just rename it.
On Fri, Apr 3, 2020 at 9:20 AM Laurent MICHEL <
laurent.michel at astro.unistra.fr> wrote:
> Mark,
>
> To me, a (N,M) matrix is a 2D matrix with N rows and M columns (e.g. a
> pixel array).
> You want to model a ND matrix, you have to set N (matrix dimension) as
> an attribute plus an array of N values giving the size along of each
> individual axis.
> If you want to specifically model a 2D matrix, it would be better have 2
> attributes with a non confusing names (e.g. columns, rows)
>
> Laurent
>
> Le 02/04/2020 à 16:47, CresitelloDittmar, Mark a écrit :
> > Not sure I follow. Wouldn't a Matrix2D be a Matrix with M=2, N=2?
> > We could discuss the names, but these seemed pretty standard and are
> > described as M rows, N columns. I know I always have to go back and
> > review which way is rows and which is columns, but I don't deal with
> > matrices very often.
> >
> >
> >
> > On Thu, Apr 2, 2020 at 8:50 AM Laurent MICHEL
> > <laurent.michel at astro.unistra.fr
> > <mailto:laurent.michel at astro.unistra.fr>> wrote:
> >
> > Dear,
> >
> > Comment #3:
> >
> > - The matrix operation class (Matrix) seems to refer to a 2D matrix.
> > The
> > class could be renamed Matrix2D to keep room for future high
> > dimensionality classes
> >
> > - The matrix dimensions are named N and M. Personally, I'm pretty
> sure
> > to always confuse N.M and M.N. It could be safer to renamed these
> > attributes with something more expressive like (row, columns)
> >
> > LM
> > --
> > --
> > ---- Laurent MICHEL Tel (33 0) 3 68 85 24 37
> > Observatoire de Strasbourg Fax (33 0) 3 68 85 24 32
> > 11 Rue de l'Universite Mail
> > laurent.michel at astro.unistra.fr <mailto:
> laurent.michel at astro.unistra.fr>
> > 67000 Strasbourg (France) Web
> http://astro.u-strasbg.fr/~michel
> > ---
> >
>
> --
> ---- Laurent MICHEL Tel (33 0) 3 68 85 24 37
> Observatoire de Strasbourg Fax (33 0) 3 68 85 24 32
> 11 Rue de l'Universite Mail laurent.michel at astro.unistra.fr
> 67000 Strasbourg (France) Web http://astro.u-strasbg.fr/~michel
> ---
>
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