From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: how to copy complete column (or row) of matrix to another?
Date: Tue, 5 Sep 2017 17:45:53 -0500
Date: 2017-09-05T17:45:53-05:00 [thread overview]
Message-ID: <oon9f2$ejs$1@franka.jacob-sparre.dk> (raw)
In-Reply-To: oolo0a$1djr$1@gioia.aioe.org
"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.
next prev parent reply other threads:[~2017-09-05 22:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 8:41 how to copy complete column (or row) of matrix to another? Nasser M. Abbasi
2017-09-05 22:45 ` Randy Brukardt [this message]
2017-09-05 23:10 ` Nasser M. Abbasi
2017-09-06 5:34 ` faryumg
2018-03-21 13:58 ` Marius Amado-Alves
2018-03-30 21:25 ` gerdien.de.kruyf
2017-09-06 7:17 ` Simon Wright
2017-09-06 7:31 ` Dmitry A. Kazakov
2017-09-09 22:33 ` darek
2017-09-09 22:48 ` darek
2017-09-12 12:57 ` Lucretia
2017-10-02 23:08 ` Randy Brukardt
2017-09-12 21:22 ` Johan Söderlind Åström
2017-09-17 12:01 ` Robert Eachus
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