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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada,comp.lang.pl1
Subject: Re: Does Ada need elemental functions to make it suitable for
 scientific work?
Date: Sun, 29 Jul 2012 16:22:34 +0200
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Date: 2012-07-29T16:22:34+02:00
List-Id: <comp.lang.ada>

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