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Date: Fri, 16 Mar 2018 10:59:51 -0700 (PDT)
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Subject: Re: Mathpaqs release 13-Mar-2018
From: gautier_niouzes@hotmail.com
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Xref: reader02.eternal-september.org comp.lang.ada:51034
Date: 2018-03-16T10:59:51-07:00
List-Id: <comp.lang.ada>

Hi Vincent,

> Just a few questions :
> - why not use the standard Generic Real Arrays ?
Good point! I'll update the web site with a remark from g_matrices.ads: "NB=
: For Ada 2005+ and real numbers implemented as floating-point numbers, it =
is better to use Ada.Numerics.Generic_Real_Arrays instead.". An usage of G_=
Matrices can be for complex, rational, "bignum"-rationals, etc. ...

> - Are the G_Matrices stored in Fortran convention, i.e. Column Major Orde=
r ?
By default not, but you can add a pragma Convention.

> - Are they compatible with Blas & Lapack ?
Some stuff in the lin_alg area is, but frankly it is a bit rusty (in my hea=
d)...

> - Are the SparseB matrices compatible with Matlab matrices (i.e. CSC matr=
ices)
SparseB is just a helper for Sparse package (I did it in Ada 83 around end =
1990's, it would be a private child package now (tbd)...).
There are two bodies for sparseb: one standalone, one using Blas (sparseb.b=
las.adb)

> - Are both format interoperable ?
> - Are they interchangeable, i.e is there a common class type to manipulat=
e them?

I've used for research purposes, interchangeably:
- plain matrices,
- band matrices (a matrix with zeroes outside diagonals and the cells just =
above and below) and
- sparse matrices.
I did it through generics.