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From: Hans van der Meer via ntg-context <ntg-context@ntg.nl>
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Subject: Re: Curiosity about math.random in LuaTeX
Date: Mon, 23 Aug 2021 17:24:50 +0200
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I guess the underlying library calls are from Lua5.4? Then it is perhaps =
useful to know that between 5.3 and 5.4 there is mentioned a new =
implementation for math.random. Perhaps it changes the sequence of =
random values generated? Someone who knows?

dr. Hans van der Meer


> On 23 Aug 2021, at 17:13, Hans Hagen via ntg-context =
<ntg-context@ntg.nl> wrote:
>=20
> On 8/23/2021 4:46 PM, Thierry Horsin via ntg-context wrote:
>> Hi everybody.
>> I wonder how does math.random() work in context. I found that this =
subject was discussed more than ten years ago by Otared and Taco and =
Thomas. It is clear to me how to obtain new results upon typesetting the =
same file by changing the value of math.randomseed (with os.time()).
>> If you don't change the seed, you get the same result upon each =
typesetting, and a seed is given in the .tuc file.
>> For example I have this:
>> ["randomseed"]=3D0x1.0741c18b8a4ep-6
>> How do I use (and is it possible to) this value to have the same =
result of math.random() upon typesetting another file (with a different =
name) ?
>> I could provide a same fixed seed in both files, but for some reasons =
I would like to re-use some previous results of math.random() for which =
no seed was initially given in another .tex file.
> You have to go low level ...
>=20
> % \ctxlua{utilities.randomizer.setseed(0x1.0741c18b8a4ep-6)}
> % \ctxlua{utilities.randomizer.setseed(0x1.6822232009d5p-5)}
>=20
> \setrandomseed{123}
>=20
> \starttext
>    test \randomnumber{1}{100}
>    test \randomnumber{1}{100}
>    test \randomnumber{1}{100}
> \stoptext
>=20
> btw, the 0x representation is lua's low level binary representation of =
a double.
>=20
> Hans
>=20
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
> =
__________________________________________________________________________=
_________
> If your question is of interest to others as well, please add an entry =
to the Wiki!
>=20
> maillist : ntg-context@ntg.nl / =
http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> =
__________________________________________________________________________=
_________


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">I =
guess the underlying library calls are from Lua5.4? Then it is perhaps =
useful to know that between 5.3 and 5.4 there is mentioned a new =
implementation for math.random. Perhaps it changes the sequence of =
random values generated? Someone who knows?<div class=3D""><br =
class=3D""><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-style: normal; font-variant-ligatures: =
normal; font-variant-caps: normal; font-variant-east-asian: normal; =
font-variant-position: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: 2; text-align: -webkit-auto; =
text-indent: 0px; text-transform: none; white-space: normal; widows: 2; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D"">dr. Hans van der Meer<br class=3D""><br =
class=3D""></div></div>
</div>
<div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 23 Aug 2021, at 17:13, Hans Hagen via ntg-context &lt;<a =
href=3D"mailto:ntg-context@ntg.nl" class=3D"">ntg-context@ntg.nl</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">On 8/23/2021 4:46 PM, Thierry Horsin via ntg-context =
wrote:<br class=3D""><blockquote type=3D"cite" class=3D"">Hi =
everybody.<br class=3D"">I wonder how does math.random() work in =
context. I found that this subject was discussed more than ten years ago =
by Otared and Taco and Thomas. It is clear to me how to obtain new =
results upon typesetting the same file by changing the value of =
math.randomseed (with os.time()).<br class=3D"">If you don't change the =
seed, you get the same result upon each typesetting, and a seed is given =
in the .tuc file.<br class=3D"">For example I have this:<br =
class=3D"">["randomseed"]=3D0x1.0741c18b8a4ep-6<br class=3D"">How do I =
use (and is it possible to) this value to have the same result of =
math.random() upon typesetting another file (with a different name) ?<br =
class=3D"">I could provide a same fixed seed in both files, but for some =
reasons I would like to re-use some previous results of math.random() =
for which no seed was initially given in another .tex file.<br =
class=3D""></blockquote>You have to go low level ...<br class=3D""><br =
class=3D"">% =
\ctxlua{utilities.randomizer.setseed(0x1.0741c18b8a4ep-6)}<br class=3D"">%=
 \ctxlua{utilities.randomizer.setseed(0x1.6822232009d5p-5)}<br =
class=3D""><br class=3D"">\setrandomseed{123}<br class=3D""><br =
class=3D"">\starttext<br class=3D""> &nbsp;&nbsp;&nbsp;test =
\randomnumber{1}{100}<br class=3D""> &nbsp;&nbsp;&nbsp;test =
\randomnumber{1}{100}<br class=3D""> &nbsp;&nbsp;&nbsp;test =
\randomnumber{1}{100}<br class=3D"">\stoptext<br class=3D""><br =
class=3D"">btw, the 0x representation is lua's low level binary =
representation of a double.<br class=3D""><br class=3D"">Hans<br =
class=3D""><br =
class=3D"">---------------------------------------------------------------=
--<br class=3D""> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;Hans Hagen | PRAGMA ADE<br class=3D""> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;Ridderstraat 27 | 8061 GH Hasselt | The Netherlands<br class=3D""> =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;tel: 038 477 53 69 | <a =
href=3D"http://www.pragma-ade.nl" class=3D"">www.pragma-ade.nl</a> | <a =
href=3D"http://www.pragma-pod.nl" class=3D"">www.pragma-pod.nl</a><br =
class=3D"">---------------------------------------------------------------=
--<br =
class=3D"">_______________________________________________________________=
____________________<br class=3D"">If your question is of interest to =
others as well, please add an entry to the Wiki!<br class=3D""><br =
class=3D"">maillist : <a href=3D"mailto:ntg-context@ntg.nl" =
class=3D"">ntg-context@ntg.nl</a> / <a =
href=3D"http://www.ntg.nl/mailman/listinfo/ntg-context" =
class=3D"">http://www.ntg.nl/mailman/listinfo/ntg-context</a><br =
class=3D"">webpage &nbsp;: <a href=3D"http://www.pragma-ade.nl" =
class=3D"">http://www.pragma-ade.nl</a> / <a =
href=3D"http://context.aanhet.net" =
class=3D"">http://context.aanhet.net</a><br class=3D"">archive &nbsp;: =
<a href=3D"https://bitbucket.org/phg/context-mirror/commits/" =
class=3D"">https://bitbucket.org/phg/context-mirror/commits/</a><br =
class=3D"">wiki &nbsp;&nbsp;&nbsp;&nbsp;: <a =
href=3D"http://contextgarden.net" =
class=3D"">http://contextgarden.net</a><br =
class=3D"">_______________________________________________________________=
____________________<br class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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