Re: Does Ada need elemental functions to make it suitable for scientific work?

["Nasser M. Abbasi" <nma@12000.org>]

On 7/10/2012 4:07 AM, Dmitry A. Kazakov wrote:
> On Tue, 10 Jul 2012 03:39:58 -0500, Nasser M. Abbasi wrote:
>
>> That is a start. But not enough by any means. All functions should be
>> vectorized.
>
> It is ill-defined. E.g. exp(A), where A is a matrix. Is exp(A) a matrix of
> exponents or exponent matrix?

Solved:

-----------------------
octave:21> exp(A)
ans =

     2.7183    7.3891
    20.0855   54.5982

octave:22> expm(A)
ans =

     51.969    74.737
    112.105   164.074
-----------------------------

>To me it is the second.

It is simply the way it is defined.

Just like when I read a paper, I first look for the definitions
of symbols and terms used by the author. one does not have to
guess. Everything is defined. To do these in Ada, Ada will
define them as it wishes. As long as there are there, and
well defined, no one will complain. All of these issue have
been solved in many other languages.

>A similar example for
> vectors: abs V. Is it a vector of absolute values, or maybe ||V||?
>

Also defined.

-------------------------------
octave:23> A=rand(3,1)
A =
    0.45896
    0.61557
    0.26697

octave:24> abs(V)
ans =
    3   4   5

octave:25> norm(V)
ans =  7.0711
-------------------------

--Nasser