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From: gautier_niouzes@hotmail.com
Newsgroups: comp.lang.ada
Subject: Re: ANN: miscellaneous Math routines, GPL'd
Date: Wed, 13 May 2009 04:52:16 -0700 (PDT)
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On 13 Mai, 11:25, johns...@googlemail.com wrote:

> Another irritation: =A0suppose user declares
>
> =A0 V : Vector (1..10);
> =A0 M : Matrix (0..9, 0..9);
> or worse
> =A0 M : Matrix (0..9, 2..11);
> or worse still
> =A0 M : Matrix (0..11, 2..11);
>
> How do you handle it?
> 1. shift indices during iteration inside loops in the lin alg program.
> 2. slide arrays so indices coincide.
> 3. Raise constraint_error;
> 4. Assume they won't do it.
>
> I do 3. (See for example procedure Choleski_Decompose at end of
> Disorderly-Random-Deviates.adb =A0and near bottom of
> Disorderly-Random-Deviates.ads.) =A0 But I'm not sure what to do.
> (I was going ask here on comp.lang.ada, but got lazy.)
> Generics with constrained arrays work ok for me here.

It's done here:
http://www.cs.umbc.edu/~squire/adaclass/gnatmath95 ,
generic_real_linear_equations.ads .

For using with Ada 2005's matrices, all you need is to replace
package Generic_Real_Arrays by Ada.Numerics.Generic_Real_Arrays
:-)
_________________________________________________________
Gautier's Ada programming -- http://sf.net/users/gdemont/

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