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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Subject: Re: =?utf-8?Q?=C2=B3A_Comparison_of_Four_Pseudo?=
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Date: Sat, 20 Jul 2013 02:41:16 +0200
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Xref: news.eternal-september.org comp.lang.ada:16441
Date: 2013-07-20T02:41:16+02:00
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Le Sat, 20 Jul 2013 02:18:38 +0200, Jeffrey Carter  =

<spam.jrcarter.not@spam.not.acm.org> a =C3=A9crit:

> On 07/19/2013 03:07 PM, Bill Findlay wrote:
>>
>> Why not use Ada.Numerics.{Discrete,Float}_Random ?
>
> Those are excellent when you don't care what sequence of values you ge=
t  =

> from the generator with different compilers or different platforms, bu=
t  =

> in those cases where you need to portably obtain the same sequence for=
  =

> the same seed value(s), you need to use something else.

Also and more basically, it's often suggested to not rely on a single  =

generator and use at least two ones, different enough, for comparison of=
  =

results, as most papers about Monte Carlo methods introduces this. That'=
s  =

after all just like with hash functions.

You may also favour algorithms (either in mathematical or comprehensible=
  =

source form) over libraries when, as you say, you want to be able to  =

reproduce an exact same sequence without a record of it (may weight too =
 =

much, easily some hundreds of MB), or else want the same in different  =

contexts, say Ada and SML without external binding.

And above all, this paper mentions Ada and put it at the front, so that'=
s  =

a lot worthy anyway :-D


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity