Le 29/04/2019 à 19:03, Jens Simon Strom a écrit :
Hallo Scilab équipe,
In my application it is vital - in addition to the normal focus
when using seeds - that /different/ seeds in rand("seed",seed)
produce /different/ random number series. (1) Is that the case?
Yes. However with "rand" you have a periodicit of 2^31 (this is
explained in the help page).
Please use "grand" instead of "rand", as grand produces sequences with
better properties, moreover you have the choice of the basic generator.
The default one "Mersenne-Twister" has period 2^199937. See the help
page of grand for more details.
S.
I am aware that seed has to be a non negative integer. (2) Are there
any further restrictions? (3) What is the upper bound?
The minimal example below is as expected.
Kind regards
Jens
s1=1e3;
s2=1e10;
rand("seed",s1);
r1=rand(3,1);
rand("seed",s2);
r2=rand(3,1);
//
rand("seed",s1)
r3=rand(3,1);
rand("seed",s2);
r4=rand(3,1);
r1234=[r1 r2 r3 r4] ----------------------------------------------------
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Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet
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