Thomas and Taco: thanks to both of you for your insight. I overlooked
the function math.randomseed() in Lua, and my question was mainly out
of curioisty: in practive one doesn't need to reset the random seed,
as Taco points out.
However I couldn't find the right usage of the command «
\getrandomnumber »…
Best regards: OK
On 25 oct. 2009, at 10:50, Thomas A. Schmitz wrote:
On Oct 25, 2009, at 9:26 AM, Taco Hoekwater wrote:
Otared KAVIAN wrote:
Indeed I guess that this is due to the random seed used by LuaTeX:
is it
possible to force a new random seed upon each typesetting?
The randomseed is set by context, and saved between consecutive
runs of
the same file. Normally, this is what you would want: just imagine
what
happens if each of the luatex runs in a 'context' call used a
different
value always.
However (this is mostly for Hans), there is a bug in that process:
all
randomseeds in mkiv appear to be between 0 and 1. Since
math.randomseed() expects an integer, this gives almost no
randomness at all to the seed values.
If you want near-random randomness, you can set the seed yourself
based on the return value of os.time():
\ctxlua{math.randomseed(os.time())}
Ah, that explains why I could never get random numbers in mkiv when
I tried a year ago. Another suggestion: there's also a
\getrandomnumber command available in ConTeXt, which seems to work
well.
Thomas
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