This tag is for questions pertaining to random numbers, whether pseudo random or truly random.

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10
votes
7answers
2k views

French animal generator

I'm learning Python. I'm making a random animal generator, from 5 txt files. Each file is a list of words for respectively the specie of the animal, an adjective, an origin, and a bodypart with a ...
10
votes
1answer
893 views

Solving for Bananas

This code creates a problem for the user to solve (very simple problem) it will then check if the user has got it right and will say so. ...
5
votes
0answers
62 views

ASCII dungeon generator [on hold]

I've written a simple ASCII dungeon generator. What are your thoughts on the code and coding style? Algorithm: Choose random point on "canvas" (two-dimensional array of chars with user defined size)...
2
votes
2answers
37 views

Random distribution in Ruby

Below is a Ruby implementation of a random statistical event, based on a hash with the actual observed counts of outcomes. I'd be interested in feedback in particular on what techniques I might use ...
6
votes
2answers
132 views

Python Lottery Game

How could I improve this code or make it more efficient? ...
4
votes
2answers
55 views

Cython: Weighted Random Choice

I have a Cython function the takes a list of weights/probabilities (double) and returns a random index into the list. For example ...
4
votes
1answer
71 views

Comparing three data structures for dealing with probability distributions in Java

Introduction Suppose you are given three elements \$a, b, c\$ with respective weights \$1, 1, 3\$. Now, a probability distribution data structures will return upon request \$a\$ with probability 20%, ...
9
votes
4answers
1k views

Create a list of random numbers with sum = n

I want to create a list of random integers in the range [0, 9], that sums up to 100 in Excel, using VBA. The list should be printed in a single column. The routine I've written is as follows: ...
1
vote
1answer
136 views

Random iteration over an array using divide and conquer

I have created a utility class which allows random iteration over an array. The idea is pretty much a divide and conquer approach. ...
1
vote
1answer
45 views

Galaxy generator

I'm currently working on a galaxy generator, and I was in need of getting the next that a random would use, for continuing the generation without using a blank generation (re-run previous generation). ...
4
votes
1answer
67 views

Virtual Lotto Task

I had the task to write a Lotto simulator. My program works as follows: To start, the user can type in 6 numbers. Then the winning numbers are randomly chosen. The program then shows the winning ...
4
votes
1answer
87 views

C++ template to randomly choose from N elements with uniform distribution

There is a nice algorithm to randomly choose an element from a list in a single pass: Pass through the list keeping the element chosen so far (X) and the number of elements processed (N). When ...
4
votes
1answer
66 views

A little advanced mouse clicker in Bash for Linux

My today's goal was to create a little advanced mouse clicker in Bash for Linux powered by xdotool. This clicker implements 15 pixel random range in which it clicks ...
2
votes
1answer
97 views

csvshuf: a tool to shuffle CSV columns written in Python

Edit: After reading Gareth's answer I have pushed an updated version of the code to github. I needed to shuffle cells from specific columns in several CSV files. One of the requirements was to be ...
2
votes
0answers
31 views

Generate sample of permuted sequences with non-repeating elements

I have a very long sequence of letters (>20000 elements long). I want to permute them so that I have another sequence using the same letters but in a different order but still with the property of no ...
3
votes
2answers
91 views

Assembling edges of a graph

I'm making a neural network that comprises five populations of feature-selective neurons and one population of non-selective neurons. Each neuron in this network receives connections from c * f * ...
5
votes
3answers
92 views

Command line password generator

I built a random password generator in Java which is meant to be run from the command line. It accepts options for: Length Upper case letters Lower case letters Special characters Numbers The ...
-2
votes
3answers
121 views

Generating a very long random string of letters

I was trying to fill a file with about ten million random characters (a-z,A-Z,' '). To my surprise the code is extremely slow. I inserted this print ...
3
votes
2answers
71 views

Simple 'Evolution of Text' app

I'm a complete beginner to Python, and wanted to get some feedback on my first app. I tried to make a clone of the 'evolution of text' app found on the Using Python website. Enter some text, and ...
5
votes
2answers
92 views

Monte Carlo simulation of amoeba population

I wrote a simple Python simulation to answer the "Amoeba" population question posed here: A population of amoebas starts with 1. After 1 period that amoeba can divide into 1, 2, 3, or 0 (it can ...
1
vote
0answers
21 views

Password Entropy in Lazarus (Delphi-like)

My today's goal was to create a function, which would evaluate the entropy of a given string password. It's mostly about how random the password is. This little code is based on the C# code from Jeff ...
1
vote
2answers
81 views

Select random row using PDO

What do you think of this way to generate a random number from the total rows in a table? I would like to create a page that random.php precisely generates a random ID and shows it. ...
2
votes
0answers
52 views

PHP Lottery Simulator

I have a lottery simulator on my website that simulates you playing the lottery every week until your death and tells you how much you would have won or lost. It can take a custom number of balls and ...
3
votes
1answer
74 views

Sleeping barber problem in Erlang

I'm learning Erlang. It's my first time with a non-imperative programming language. I've written a code and I want some thoughts about it: Is my logic easy to understand? Is my code idiomatic? Is ...
2
votes
1answer
122 views

C# console roulette game

I made a C# console roulette game. Check it out and give opinions on how to improve or ideas for some other features? It's not finished yet so it has lots of room for improvement. I am very new so ...
3
votes
2answers
64 views

Cryptographically Secure Pin Generator using RNGCryptoServiceProvider

In my system I have a SMS authentication. Users input their user-id and get sent an SMS with a 5 digit pin number they input in a website to log in. The pin has a lifetime of a few minutes. This pin ...
-1
votes
2answers
73 views

Maths quiz with difficulty levels and a score database

How can I make the saving to the dictionaries more efficient as well as making my overall code more efficient? ...
-2
votes
1answer
145 views

On Finding Coin Jams

The problem can be found here and is essentially asking us to generate J many numbers containing N many digits, where these digits have to be either 0 or 1. The catch is that the these numbers that we ...
6
votes
1answer
44 views

Randomly selecting an adjective and noun, combining them into a message

This is my first Rust program. I have previously written a lot of Python, and some C. I would like some advice on whether I am doing things idiomatically, and any improvements I could make! I also ...
5
votes
2answers
73 views

Determine playing card

I would like a code review on the coding I did for my assignment. The reason I have asked here is because my lecturer has no intention of going through (Don't ask me why, I asked before and he said no....
1
vote
3answers
106 views

Distributing cards to players in C++

I have written this program to deal 7 cards to one player. ...
3
votes
1answer
78 views

Generate 6 random numbers for lottery in PHP

This program generates 6 random numbers between 0 and 45 and the numbers cannot be reapeated. Can this code be improved? ...
3
votes
6answers
428 views

Creating an array of random numbers with no duplicates

I only need three random numbers within the range of 1-54 (deck of cards) and none of the three numbers can be a duplicate. I cannot use an ArrayList; I must use a ...
1
vote
1answer
32 views

Using semaphore in C

This is my first time using semaphores and I was wondering if I implemented them to the best of their abilities in my code.... ...
5
votes
1answer
113 views

Generating XKCD passwords

Obviously, everyone should use a password manager to generate and store long unique random strings of characters for the vast majority of their passwords. However, one still needs to memorize a master ...
0
votes
2answers
80 views

Random Walk simulator seems slow, are there ways to optimize my code?

I'm trying to write a short random walk simulator in which an agent has a 50% chance on each "round" to either move toward x or back to its initial position. If the agent is already at its initial ...
3
votes
2answers
167 views

Heightmap generation using midpoint displacement

I am writing a program to generate a height map following the midpoint displacement algorithm (somewhat similar to diamond-square). I'm at the point where I have a recursive program that paints the ...
3
votes
2answers
217 views

“Guess my Number” game in Python (2.7.9)

First time posting to Code Review. Just looking to get some advice on how I can write better code. I found the following exercise for a "Guess my Number" game on DaniWeb, but the linked source code ...
3
votes
1answer
63 views

Portably generate uniformly random floats from mt19937 output

My goal is to generate a sequence of random float from a seeded random generator. The sequence should be the same on any machine / any compiler -- this rules out ...
-2
votes
0answers
26 views

Assigning distinct random numbers to variables [closed]

I'm attempting to generate non repeating random numbers between 1-5, 1-10, 1-20, etc. I'm on to the Fisher-Yates Shuffle but I'm not sure I've implemented it in the best way. My plan is to associate ...
3
votes
1answer
31 views

Python Weighted Object Picker

I've designed a class ObjectPicker that can be given objects and weights. Objects can be picked randomly out of the ObjectPicker,...
10
votes
4answers
2k views

Randomly generate spelling mistake in string

My code will generate a spelling mistake inside of a string 50% of the time. It will retrieve a letter from a random index in the string like, "t" and then duplicate that letter like, "tt" and store ...
3
votes
2answers
99 views

Simple function to generate a list of letters

I would like get some suggestions for improvement of this function, and alert me about any dodgy practices that you find. I have been trying to learn python for a short time now and I would like to ...
5
votes
2answers
78 views

Randomized Lighting with Python

I use this to automate the lights in my home while I am away at night (simulating presence). The scheduling of when this runs is handled by my home automation software (Indigo Domotics). I'm open to ...
2
votes
2answers
39 views

Choose a color with probability proportionate to its weight in a group of colors

Input: An array of colors with weights. e.g [['red', 10], ['blue', 20], ['green', 30]] Output: A random color from the array, based on it's proportion to the other ...
2
votes
2answers
62 views

Random positioning and movement of a rabbit on a table

I was inspired by this: If you would put a rabbit randomly on a circular table with radius r= 1 meter and it moves 1 meter in a random direction, what is the chance it won't fall off? I ...
2
votes
1answer
57 views

Sampling with weighted probabilities

In an exam question I need to output some numbers self.random_nums with a certain probability self.probabilities: I have ...
3
votes
2answers
67 views

Adding an 'enemy' to a game (with randomized properties)

I'm working on a game using the now abandoned Famo.us Javascript framework. I have the game in a running prototype and I'm building with Cordova and running it on an iPhone 6 using PhoneGap. There ...
2
votes
2answers
151 views

Beginning dice game

This is my first dice game and I have spent countless hours working on it, yet it is still very basic. I was wondering if anyone could spare the time to suggest improvements. ...
4
votes
2answers
66 views

Normalized random position generator

I place various divs on screen by adding random x and y positions successively normalized with this function. My question is, how well is it written? Can I improve it? If so, then how? I am worried ...