GNU bug report logs - #9103
23.3.50; random* from cl does not support the whole range of integers

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Package: emacs; Severity: minor; Reported by: Leo <sdl.web@HIDDEN>; dated Sun, 17 Jul 2011 04:04:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
bug Marked as found in versions 28.0.50. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#9103: 23.3.50; random* from cl does not support the whole
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Leo <sdl.web@HIDDEN> writes:

> As far as I can see, (random* most-positive-fixnum) only returns a 32bit
> integer on 64bit Emacs. This might be an oversight given the age of
> cl.el.

This seems to be an issue also with cl-random on current master, AFAICT.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
To: Lars Magne Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#9103: 23.3.50;
	random* from cl does not support the whole range of integers
References: <m1pql9eepx.fsf@HIDDEN> <w962mzb6ce.fsf@HIDDEN>
	<0i1uxnb69f.fsf@HIDDEN> <m31uvn22an.fsf@HIDDEN>
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Lars Magne Ingebrigtsen <larsi@HIDDEN> writes:

> `random*' ends with
>
> (* (/ n '8388608e0) lim)
>
> if LIM isn't an integer.  Anybody willing to hazard a guess why
> 8388608.0 was chosen?

Because that's the range of n.

Andreas.

-- 
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Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

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From: Lars Magne Ingebrigtsen <larsi@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#9103: 23.3.50;
	random* from cl does not support the whole range of integers
In-Reply-To: <0i1uxnb69f.fsf@HIDDEN> (Glenn Morris's message of
	"Mon, 18 Jul 2011 17:58:36 -0400")
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Glenn Morris <rgm@HIDDEN> writes:

> Glenn Morris wrote:
>
>> Why does random* even need to exist? What can it do that plain random
>> cannot?
>
> ...non-integer results, it seems.

`random*' ends with

(* (/ n '8388608e0) lim)

if LIM isn't an integer.  Anybody willing to hazard a guess why
8388608.0 was chosen?

And would it make sense to just replace it all with a call to `random',
and then make it into a floating point if it floats?

-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

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Subject: Re: bug#9103: 23.3.50; random* from cl does not support the whole
	range of integers
To: Leo <sdl.web@HIDDEN>
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On Tue, Jul 19, 2011 at 03:21, Leo <sdl.web@HIDDEN> wrote:

> The
> files mt19937.[ch] are from its authors'. Do you know if that can be
> included in Emacs?

From http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/elicense.html :

"Until 2001/4/6, MT had been distributed under GNU Public License, but
after 2001/4/6, we decided to let MT be used for any purpose,
including commercial use. 2002-versions mt19937ar.c, mt19937ar-cok.c
are considered to be usable freely."

=C2=A0 =C2=A0 Juanma
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

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From: Leo <sdl.web@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#9103: 23.3.50;
	random* from cl does not support the whole range of integers
References: <m1pql9eepx.fsf@HIDDEN> <w962mzb6ce.fsf@HIDDEN>
	<0i1uxnb69f.fsf@HIDDEN>
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On 2011-07-19 05:58 +0800, Glenn Morris wrote:
> Glenn Morris wrote:
>
>> Why does random* even need to exist? What can it do that plain random
>> cannot?
>
> ...non-integer results, it seems.

We need to extend plain random to support random-states. I plan to do it
once the random module in gnulib is usable.

Another option is to use Mersenne Twister PRNG, which I have in my local
tree (patch: http://paste.pocoo.org/show/ZYhLUPeXlkj405100KX4/). The
files mt19937.[ch] are from its authors'. Do you know if that can be
included in Emacs?

Leo
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

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From: Glenn Morris <rgm@HIDDEN>
To: Leo <sdl.web@HIDDEN>
Subject: Re: bug#9103: 23.3.50;
	random* from cl does not support the whole range of integers
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In-Reply-To: <w962mzb6ce.fsf@HIDDEN> (Glenn Morris's message of
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Glenn Morris wrote:

> Why does random* even need to exist? What can it do that plain random
> cannot?

...non-integer results, it seems.
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

Message received at 9103 <at> debbugs.gnu.org:


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From: Glenn Morris <rgm@HIDDEN>
To: Leo <sdl.web@HIDDEN>
Subject: Re: bug#9103: 23.3.50;
	random* from cl does not support the whole range of integers
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Leo wrote:

> As far as I can see, (random* most-positive-fixnum) only returns a 32bit
> integer on 64bit Emacs.

Why does random* even need to exist? What can it do that plain random
cannot?
Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Leo <sdl.web@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 23.3.50; random* from cl does not support the whole range of integers
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As far as I can see, (random* most-positive-fixnum) only returns a 32bit
integer on 64bit Emacs. This might be an oversight given the age of
cl.el.

Leo
Acknowledgement sent to Leo <sdl.web@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#9103; Package emacs. Full text available.
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