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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Interfacing Ada with C
Date: Sun, 25 Jul 2010 09:29:55 +0100
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Date: 2010-07-25T09:29:55+01:00
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Ada novice <posts@gmx.us> writes:

> On Jul 24, 6:38 pm, Simon Wright <si...@pushface.org> wrote:
>
>> but on a Windows machine it'll be something li
>> <install-dir>\<gnat-release>\lib\gcc\<architecture>\<gcc-release>\adainclude\a-ngrear.ad[sb]
>>
>> This will lead you to System.Generic_Real_BLAS (s-gerebl.ad[sb]) and
>> System.Generic_Real_LAPACK (s-gerela.ad[sb]), which are interfaces to
>> the corresponding external libraries.
>>
>> Not sure that these will fit your 'simple' criterion, though!
>>
>> --S
>
> Thanks. I've been able to locate these files under GNAT on my Windows
> machine and read them. For eigensystems operations, only symmetric and
> hermitian (complex-symmetric) matrices are allowed. I would like
> however to be able to deal with a general non-symmetric matrix and
> this I believe is not possible right now with Ada.

No, but those files implement interfaces to those *parts of* the
external libraries BLAS and LAPACK that were necessary to implement the
Numerics annex.

It may be that the other parts of those libraries contain the features
you're looking for, in which case you have a head start on your own
implementation.

But, if not, you can at least see one approach to the job that you could
adopt for the external library of your choice.