Gentoo Archives: gentoo-user

From: "Canek Peláez Valdés" <caneko@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Re: Re: OT: Mapping random numbers (PRNG)
Date: Sun, 29 Jun 2014 00:53:37
Message-Id: CADPrc83NbuNwAog_QQZWJoGArqTZDUsDwVAbiXSNDJ+3by3_xw@mail.gmail.com
In Reply to: Re: [gentoo-user] Re: Re: OT: Mapping random numbers (PRNG) by gottlieb@nyu.edu
1 On Sat, Jun 28, 2014 at 7:37 PM, <gottlieb@×××.edu> wrote:
2 > On Sat, Jun 28 2014, Canek Peláez Valdés wrote:
3 >
4 >> That doesn't matter. Take a non-negative integer N; if you flip a coin
5 >> an infinite number of times, then the probability of the coin landing
6 >> on the same face N times in a row is 1.
7 >
8 > This is certainly true.
9 >
10 >> This means that it is *guaranteed* to happen
11 >
12 > That is not as clear.
13
14 Let me be more precise (and please correct me if I'm wrong): It is
15 guaranteed to happen at some point in the infinite sequence of random
16 flip coins, but we cannot know when it will happen, only that it will
17 happen.
18
19 That's the way I got it when I took my probability courses, admittedly
20 many years ago.
21
22 In any way, even if I'm wrong and it is not guaranteed, the main point
23 remains true: the probability of getting a large sequence of the same
24 number from a RNG is 1 for every true random RNG, and therefore seeing
25 a large sequence of the same number form a RNG doesn't (technically)
26 means that it is broken.
27
28 Regards.
29 --
30 Canek Peláez Valdés
31 Profesor de asignatura, Facultad de Ciencias
32 Universidad Nacional Autónoma de México

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[gentoo-user] Re: OT: Mapping random numbers (PRNG) "»Q«" <boxcars@×××.net>