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Questions tagged [prng]

PRNG - Pseudorandom number generator, A pseudorandom number generator (PRNG), also known as a deterministic random bit generator (DRBG),[1] is an algorithm for generating a sequence of numbers that approximates the properties of random numbers.

See more about PRNG on wikipedia.org

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Create programmatic colour picker

How would one create a deterministic Javascript HTML colour picker which given arguments of how many colours are desired returns an array of HTML hex colour codes, ie: function createColours(numColours) { return [/* colours array of size…
j pimmel
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Generate Array of Numbers that fit to a Probability Distribution in Ruby?

Say I have 100 records, and I want to mock out the created_at date so it fits on some curve. Is there a library to do that, or what formula could I use? I think this is along the same track: Generate Random Numbers with Probabilistic…
Lance
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Cryptographically secure PRNG (PseudoRandom Number Generator)

What is the best and fastest algorithm to generate cryptographically secure PRNG? My requirements is as follows. In each run, I need to generate few millions of numbers with length of 10. It should not allow one to predict future iterations by…
Parvin Gasimzade
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ios Swift: looking for a cross compatible method to Java's Random() PRNG that has identical output

Here's my delimna: I am writing an application that needs to exactly reproduce the PRNG output from a game that was written in Java that uses the Java random() with a given seed to create all it's initial game 'world' data. The problem I am…
dano
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Seeding Python's PRNG with a tuple

I notice that if I seed Python's PRNG with a tuple, I get different results each time I do it. That is, the Python 3.4 program: import random seed1 = ('Foo', 'Bar') random.seed(seed1) print(random.random()) prints a different number each time it is…
xnx
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Generating a Pseudo-random sequence of plus/minus 1 integers

Can anybody help me create a simple pseudo-random sequence of +-1 integers with length 1000 using Matlab? I.e. a sequence such as -1 -1 1 1 -1 -1 1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 1 I tried using this code below but this is the RANGE -1 to 1, which…
bonapart3
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std::mt19937 doesn't return random number

I have the following piece of code: unsigned int randomInt() { mt19937 mt_rand(time(0)); return mt_rand(); }; If I call this code, for example 4000 times in a for loop, I don't get random unsigned integers, instead I get for example 1000…
marc3l
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Encryption with Android 4.2 and earlier versions - PRNGFixes

I need to encrypt password, but for Android 4.2 and below version, my solution doesn't work, The encrypted password is random. it's due to PRNG. So I saw this post : https://android-developers.blogspot.com/2013/08/some-securerandom-thoughts.html I…
NonowPoney
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How to create a "random-pareto" in NetLogo?

Since I am not well-versed in mathematics, I am struggling with the implementation of a random number generator in NetLogo which follows roughly a pareto distribution. This is the follow-up question of this one here, where I would like to substitue…
Til Hund
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several random numbers c++

I am a physicist, writing a program that involves generating several (order of a few billions) random numbers, drawn from a Gaussian distribution. I am trying to use C++11. The generation of these random numbers is separated by an operation that…
contrariwise
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How to use Intel Ivy Bridge's RNG?

I read that Intel Ivy Bridge processors provide a RNG (RdRand). But how do I use this? My CPU E3-1270v2 does not provide a RNG flag. flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse…
user1091344
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What is the time complexity of the Mersenne twister?

I have read that "the computational complexity of the Mersenne twister is O(p2) where p is the degree of the polynomial". What does this mean? Which polynomial is this referring to? Also, is computational complexity another way of saying time…
hannah
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Generate random integers from random bit sequence

Very basic question but I can't seem to find the answer on Google. A standard PRNG will generate a sequence of random bits. How would I use this to produce a sequence of random integers with a uniform probability distribution in the range [0, N)?…
jcai
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Seedable CSPRNG in Ruby

Does Ruby provide functionality to run a seedable CSPRNG? From the standard library, OpenSSL/SecureRandom is cryptographically secure, but not seedable. Random is seedable, but not cryptographically secure. Alternatively, what is a secure way to…
user2398029
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Generating Doubles With XORShift Generator

So I am using the Wikipedia entry of XORShift Generators to make a PRNG. My code is as follows. uint32_t xor128(void) { static uint32_t x = 123456789; static uint32_t y = 362436069; static uint32_t z = 521288629; static uint32_t w =…
CMilby
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