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From: "John B. Matthews" <nospam@nospam.invalid>
Newsgroups: comp.lang.ada
Subject: Re: How to initialize a matrix of one column only?
Date: Sat, 07 Jul 2012 21:47:09 -0400
Organization: The Wasteland
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Date: 2012-07-07T21:47:09-04:00
List-Id: <comp.lang.ada>

In article <jtaj2c$18k$1@speranza.aioe.org>,
 "Nasser M. Abbasi" <nma@12000.org> wrote:
[...]
> Here is the code, I write
> 
> ----------------------
> with Interfaces.Fortran;
> use  Interfaces.Fortran;
> with lbase;
>    ....
>    N: Fortran_Integer := 3;
>    B: labase.Fortran_Real_Matrix ( 1..N, 1..1  );
> BEGIN
>    B := ((9.0) ,    -- here is the problem
>          (2.0) ,
>          (-2.0));
>    ....
> --------------------------------------------
> 
> where the labase package simply introduces a type for
> Fortran_Real_Matrix as follows
> 
> ----------------------------
>    type Fortran_Real_Matrix is array (Fortran_Integer range <>,
>                                       Fortran_Integer range <>)
>           of Real;
>      pragma Convention (Fortran, Fortran_Real_Matrix);
> --------------------
> 
> 
> >gnatmake -I../ada  lap42.adb
> gcc -c -I../ada lap42.adb
> lap42.adb:35:16: nested array aggregate expected
> lap42.adb:35:16: if single-component aggregate is intended, write e.g. (1 => 
> ...)
> gnatmake: "lap42.adb" compilation error
> >
> 
> I tried B:=(1=>9.0,2=>2.03=>-2.0);
> and B := ((9.0 ,2.0 , 3));
> but non working.
> 
> What is the correct syntax to use?

According to 4.3.3 Array Aggregates, you need to use named notation for 
a single component, otherwise "a single expression in parentheses is 
interpreted as a parenthesized expression."

   B := ((1 =>  9.0),
         (1 =>  2.0),
         (1 => -2.0));

<http://www.ada-auth.org/standards/12rm/html/RM-4-3-3.html>

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>