From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Does Ada need elemental functions to make it suitable for scientific work?
Date: Sun, 29 Jul 2012 16:22:34 +0200
Date: 2012-07-29T16:22:34+02:00 [thread overview]
Message-ID: <migrc2viocso$.71k736ggloqr.dlg@40tude.net> (raw)
In-Reply-To: 0a4d8d8d-834b-4851-9a3a-f7867e779ebe@d6g2000pbt.googlegroups.com
On Sun, 29 Jul 2012 06:39:58 -0700 (PDT), Robin Vowels wrote:
> On Jul 12, 5:12�pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
>> On Wed, 11 Jul 2012 17:31:33 -0700 (PDT), rrrrrrr@gmail.com wrote:
>>>> It is ill-defined. E.g. exp(A), where A is a matrix. Is exp(A) a matrix of
>>>> exponents or exponent matrix?
>>
>>> In languages that provide whole array operations (i.e.,
>>> element-by-element operations -- such as PL/I and Fortran),
>>> it is the former.
>>
>>> BTW., I think you mean matrix exponential, which is a far
>>> less common operation than exp(A) or e**A(i) for i = 1 to n,
>>
>> In linear algebra, provided matrices mean matrices, per-element operation
>> just does not make any sense.
>
> Element-by-element operations are required routinely in numerical
> work.
I wrote specifically about matrices as known in linear algebra.
> PL/I defined multiplication for matrices as an element-by-element
> product, as I said before.
Sorry for PL/1!
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2012-08-01 2:52 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 23:27 Does Ada need elemental functions to make it suitable for scientific work? Nasser M. Abbasi
[not found] ` <d78nv7dhf88bqv7hrd9eft231a4h2scs10@invalid.netcom.com>
2012-07-10 4:22 ` Nasser M. Abbasi
2012-07-10 14:26 ` Marco
2012-07-10 4:24 ` gautier_niouzes
2012-07-10 5:22 ` Ada novice
2012-07-10 7:27 ` Dmitry A. Kazakov
2012-07-10 8:06 ` gautier_niouzes
[not found] ` <637de084-0e71-4077-a1c5-fc4200cad3cf@googlegroups.com>
2012-07-10 8:39 ` Nasser M. Abbasi
2012-07-10 8:58 ` Ada novice
2012-07-10 9:07 ` Dmitry A. Kazakov
2012-07-10 9:21 ` Nasser M. Abbasi
2012-07-10 9:26 ` Nasser M. Abbasi
2012-07-10 9:50 ` Dmitry A. Kazakov
2012-07-20 1:56 ` Randy Brukardt
2012-07-20 21:49 ` Adam Beneschan
2012-07-12 0:31 ` robin.vowels
2012-07-12 7:12 ` Dmitry A. Kazakov
2012-07-29 13:39 ` Robin Vowels
2012-07-29 14:22 ` Dmitry A. Kazakov [this message]
2012-07-29 20:54 ` glen herrmannsfeldt
[not found] ` <apib1897s56dkultqmfl3emvk1os3tfdak@invalid.netcom.com>
2012-07-30 4:15 ` glen herrmannsfeldt
[not found] ` <nfhd181tv9u87mcqfb7rgd8lm48ihr9f4r@invalid.netcom.com>
2012-07-31 8:53 ` MATRIX MULTIPLICATION Robin Vowels
2012-07-31 9:05 ` Robin Vowels
2012-07-30 0:49 ` Does Ada need elemental functions to make it suitable for scientific work? Robin Vowels
2012-07-12 0:22 ` robin.vowels
2012-07-20 1:51 ` Randy Brukardt
2012-07-29 13:53 ` Robin Vowels
2012-07-29 15:51 ` J-P. Rosen
2012-07-29 16:07 ` Dmitry A. Kazakov
2012-07-29 20:30 ` Simon Wright
2012-07-29 20:59 ` glen herrmannsfeldt
2012-07-29 21:44 ` J-P. Rosen
2012-07-29 22:54 ` Simon Wright
2012-07-30 0:53 ` Robin Vowels
2012-07-30 2:20 ` Shmuel Metz
2012-07-10 12:46 ` Brian Drummond
2012-07-10 11:06 ` Simon Wright
2012-07-10 11:59 ` Georg Bauhaus
2012-07-10 12:20 ` Brian Drummond
2012-07-10 19:52 ` Ada novice
2012-07-11 8:41 ` gautier_niouzes
2012-07-11 9:42 ` Ken Thomas
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