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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: ada lapack
Date: Sat, 18 Aug 2012 16:13:33 +0300
Organization: Tidorum Ltd
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Date: 2012-08-18T16:13:33+03:00
List-Id: <comp.lang.ada>

On 12-08-18 14:57 , Ada novice wrote:
> If in an example file given say example01.adb one needs to add 2
> matrices. We have the given "matrix" and we can make a copy
> "matrix_copy". Writing
> 
>    sum_two_matrices := matrix + matrix_copy;
> 
> gives an compilation error
> 
> ---there is no applicable operator "+" for type "Complex_Matrix" at
> ada_lapack.ads:69, instance at line 24---
> 
> The Complex_Matrix type defined in G.3.2 complex vectors and matrices
> of the ARM can do addition + operations. The Complex_Matrix as
> defined in ada_lapack.ads:69 seems different.

They are indeed different types. The standard package
Ada.Numerics.Generic_Complex_Arrays provides the "+" operator (and
several other operators) but ada_lapack.ads does not.

If you want a "+" for Ada_Lapack.Complex_Matrix, you must define one
yourself, either in ada_lapack.ads/adb (best option) or in your own
code. You code the "+" function just like any other Ada function, except
that its name is "+":

   function "+" (Left, Right : Complex_Matrix) return Complex_Matrix
   is
   begin
     ...
   end "+";


-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
      .      @       .