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:
>
> 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"]=0x1.0741c18b8a4ep-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 ...
>
> % \ctxlua{utilities.randomizer.setseed(0x1.0741c18b8a4ep-6)}
> % \ctxlua{utilities.randomizer.setseed(0x1.6822232009d5p-5)}
>
> \setrandomseed{123}
>
> \starttext
> test \randomnumber{1}{100}
> test \randomnumber{1}{100}
> test \randomnumber{1}{100}
> \stoptext
>
> btw, the 0x representation is lua's low level binary representation of a
> double.
>
> Hans
>
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> Hans Hagen | PRAGMA ADE
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