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Newsgroups: comp.lang.ada
Date: Sat, 9 Sep 2017 15:48:03 -0700 (PDT)
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Subject: Re: how to copy complete column (or row) of matrix to another?
From: darek <darek.maksimiuk@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:48003
Date: 2017-09-09T15:48:03-07:00
List-Id: <comp.lang.ada>

On Tuesday, 5 September 2017 10:41:49 UTC+2, Nasser M. Abbasi  wrote:
> I have not programmed in Ada for long time. I forgot now if
> Ada supports copying whole column or whole row of 2D matrix
> in one operation or not?
> 
> Here is a toy example. I want to copy one matrix
> to another using a loop (to see if this is allowed)
> 
> --------------------------
> procedure t1 is
>     type Matrix is array (Integer range <>, Integer range <>) of Integer;
>     A : Matrix  :=
>             (( 1,  2,  3),
>             (  4,  5,  6),
>             (  7,  8,  9));
>     B: Matrix(1..3,1..3);
> begin -- copy A to B one row at a time
> 
>     FOR I in A'range(1) LOOP
>         B(I,1..3):=A(I,1..3); -- error at this line
>     END LOOP;
> 
> end t1;
> ---------------------
> 
> I see old thread that slicing is not allowed for matrix?
> 
> https://groups.google.com/forum/#!topic/comp.lang.ada/vwPXMabvUR8
> "Copying rows in a two dimensional array."
> 
> Is this the reason for the error I get or Am I doing something
> silly in the above?
> 
> Using gnat 2017
> 
> thanks
> --Nasser

One more link I forgot to add in my previous e-mail: 
https://www.inf.ethz.ch/personal/felixf/pdfs/2006_ArrayStructuredOT.pdf