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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: how to copy complete column (or row) of matrix to another?
Date: Tue, 5 Sep 2017 17:45:53 -0500
Organization: JSA Research & Innovation
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Date: 2017-09-05T17:45:53-05:00
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"Nasser M. Abbasi" <nma@12000.org> wrote in message 
news:oolo0a$1djr$1@gioia.aioe.org...
>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?

No, that's not supported. It would be a distributed overhead to allow (that 
is, it would make all 2D operations slower), as the components of a slice 
would not necessarily be contiguous.

In some cases, it makes more sense to declare a 1D array of a 1D array. Then 
you can slice the arrays. (That wouldn't make much sense for a true matrix; 
that's not something I use much, so most of my types tend to be arrays of 
arrays.)

...
> 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?

Yup. (Both statements are true. ;-)

                        Randy.