From: "Nasser M. Abbasi" <nma@12000.org>
Subject: Re: Any easy/build-in construct to extract submatrices from larger matrix?
Date: Sun, 24 Jun 2012 07:16:50 -0500
Date: 2012-06-24T07:16:50-05:00 [thread overview]
Message-ID: <js70fg$pse$1@speranza.aioe.org> (raw)
In-Reply-To: 1xzo3825h9yt7$.45flobqwlel6.dlg@40tude.net
On 6/24/2012 6:10 AM, Dmitry A. Kazakov wrote:
> And to me the problem is not clear. Are you writing a concrete program or
> considering a proper way to model matrix lattices in a strongly typed
> programming language? The difference is huge.
>
>
Dmitry;
I was try to implement, just for fun, finding the adjungate
matrix, using the direct algorithm using Ada, as shown here:
http://en.wikipedia.org/wiki/Adjugate_matrix
it requires finding the cofactors of each element in a 2D matrix.
Hence needed a simply way to obtain a submatrix from the main
matrix. I understand that slices are not supported for 2D matrices
in Ada. Only for 1D.
I think something like pack() (and unpack()) functions would be
useful to have in Ada:
http://fortranwiki.org/fortran/show/pack
pack() allows one to extract rows/columns, not necessarily
in sequence, out of a matrix using a mask matrix. This is
very useful for many linear algebra operations on matrices.
thanks,
--Nasser
next prev parent reply other threads:[~2012-06-24 12:16 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-24 8:05 Any easy/build-in construct to extract submatrices from larger matrix? Nasser M. Abbasi
2012-06-24 8:24 ` Dmitry A. Kazakov
2012-06-24 8:55 ` Nasser M. Abbasi
2012-06-24 11:10 ` Dmitry A. Kazakov
2012-06-24 12:16 ` Nasser M. Abbasi [this message]
2012-06-24 16:11 ` Dmitry A. Kazakov
2012-06-24 17:14 ` Nasser M. Abbasi
2012-06-24 18:33 ` Dmitry A. Kazakov
2012-06-25 5:44 ` J-P. Rosen
2012-06-25 6:32 ` Nasser M. Abbasi
2012-06-25 7:54 ` J-P. Rosen
2012-06-25 8:20 ` Dmitry A. Kazakov
2012-06-25 14:21 ` Nasser M. Abbasi
2012-06-25 8:36 ` Georg Bauhaus
2012-06-25 13:17 ` Nasser M. Abbasi
2012-06-26 11:44 ` Georg Bauhaus
2012-06-25 16:49 ` Pascal Obry
2012-06-25 17:36 ` Nasser M. Abbasi
2012-06-25 18:49 ` stefan-lucks
2012-06-26 4:41 ` Nasser M. Abbasi
2012-06-26 7:15 ` Jacob Sparre Andersen
2012-06-26 9:51 ` Nasser M. Abbasi
2012-06-25 9:33 ` Simon Wright
2012-06-26 2:48 ` Jerry
2012-06-26 4:19 ` Nasser M. Abbasi
2012-06-26 7:06 ` Nasser M. Abbasi
2012-06-26 12:54 ` Robert A Duff
2012-06-26 15:19 ` Adam Beneschan
2012-06-26 21:14 ` Robert A Duff
2012-06-27 23:42 ` Shark8
2012-06-26 7:10 ` Dmitry A. Kazakov
2012-06-26 15:06 ` Adam Beneschan
2012-06-26 21:19 ` Robert A Duff
2012-06-26 21:40 ` Adam Beneschan
2012-07-03 4:22 ` Randy Brukardt
2012-07-03 8:37 ` Dmitry A. Kazakov
2012-07-05 1:33 ` Randy Brukardt
2012-07-05 7:08 ` Dmitry A. Kazakov
2012-07-06 23:47 ` Randy Brukardt
2012-07-07 8:22 ` Dmitry A. Kazakov
2012-07-05 18:56 ` Adam Beneschan
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox