Questions tagged [shuffle]

Shuffling is the act of randomizing the order of the elements in a collection.

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37 views

Randomizing a List [closed]

I have this code, and it's working well. The input list is randomly shuffled very nicely. But I'm having a little trouble understanding WHY it's working. Specifically, what role does ...
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Fisher-Yates shuffle in Haskell

This is the Haskell version of my recursive Fisher-Yates shuffle in JS. ...
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A basic trivia app

The app grabs 10 questions from an API, displays them one by one with 4 multiple choice answers. These answers are clickable buttons that alert to whether the answer is correct or not. Finally the ...
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Deck of cards with shuffle and sort functionality

Going through Head First C#'s Chapter 8: Enums and Collections, I learned about List<T>, as well as IComparable<T> ...
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88 views

Sudoku generator using seed Sudoku

I have created a Sudoku generator in Java. Here I am using a basic solved sudoku as seed and by transposing it and shuffling its row and columns I get a new solved sudoku. ...
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1answer
128 views

Game to shuffle and guess a word

I'm new to C++ and while learning, I wrote a simple program that asks for a word, shuffle sthe characters and then asks another person to find the original word, given the shuffled letters. I would ...
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3answers
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Confuse a text without making it unreadable

Scientists have found that a text can still be read even if only the first and last letter of a word are in their right place. The remaining characters within the word can be arranged randomly. ...
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1answer
597 views

Shuffle deck of cards in JavaScript

I know randomness in programming can be a deep topic, and searching the topic seems to result in Fisher-Yates being the best method, but I'm curious what people would say about this method. Basically,...
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115 views

Shuffle array elements by rearranging the key value associations

PHP's shuffle() function destroys the array keys, so I decided to write a shuffle function that doesn't do that and instead rearranges key-value associations. As I ...
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2answers
78 views

Return Set<Integer> with random unique Integer numbers between min and max range

I need set of random unique Integer numbers for my unit test. I implemented this method, however I'm not sure if this is best way to implement this. ...
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243 views

Fisher-Yates shuffle Java implementation

This is my attempt at an implementation of the modern Fisher-Yates shuffle in Java. I'm not sure if it can be made more efficient, but I did my best to make it as simple as possible, and I learned how ...
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755 views

Selecting random elements from a `IList` with no repetitions

Description This is a utility algorithm that selects a number of elements from a source list without repeating elements. Background My use case is creating a random path for a NPC that has to ...
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Cards shuffling and dealing program

The program interacts between cards and four players among whom cards are to be distributed. The Program do the following function Creates a deck of cards. Shuffle the deck. Shows the deck. Deal ...
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2answers
52 views

Continuous Shuffler with “linked loop”

As an academic exercise, I decided to implement a continuous shuffler, as seen on casino blackjack tables. It operates by storing a "linked loop" (a linked list with the last element linked to the ...
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1answer
163 views

Shuffling sections of an ordered list based on tuple values

I have a list as follows and I want to shuffle the elements that have the same frequency while keeping the elements with different frequencies in the correct positions. The code below works; however, ...
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104 views

Fisher-Yates Shuffle

This is a cut-and-dried Fisher-Yates implementation. As not typically a JS developer, I've tried to incorporate as many best practices as I can. I would appreciate any input as to make it conform to ...
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1answer
310 views

Shuffle a string in a repeatable way

The following function is designed to accept a string of characters and an integer. The function returns a string that's a reordered version of the original string. The reordering process is ...
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98 views

Randomly generate set of size M from array of size N

The following algorithm attempts to randomly generate a set of size M from an array of size N. It is not based on Knuth Fisher Yates shuffle, but could someone verify its correctness? ...
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Shuffling an array keeping some elements fixed

The task is simple to understand: how to shuffle an array keeping some elements fixed. Let us take an example: starting from the array [1, 2, 'A', 3, 'B']. Having ...
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1answer
140 views

ShuffleBag (Fisher-Yates + PcgRandom)

Anything that could be done better here? ...
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1answer
56 views

Generate another random path through a complete graph

What this does is generate a random path of cities to later calculate the length of the newly generated tour of cities, the TSP. I am trying to figure out if there is a more efficient way to write ...
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338 views

Secret Santa - Pick Pairs

Interested to hear your thoughts on this Secret Santa pairs picker. It's pretty standard but I'll explain the rules all the same: All names go into a hat Each person picks a name from the hat and ...
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1answer
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getRandom() - Randomize array and get result

I've written a function that allows you to pass an array of values, which is then shuffled and returned based on a parameter $preserveArray. This is the code: <...
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309 views

Deck Shuffling Method

Just wondering if you guys think this is a good way to shuffle a deck or a bad way. Updated to show the GetRandom function as requested. ...
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1answer
177 views

Fisher-Yates shuffle in JavaScript

This is my first time making a function just from reading about it on Wikipedia, so I'm sure there's room for a lot of improvement. ...
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7k views

Python shuffle the middle letters in all the words of a sentence

The purpose of the program is to shuffle only the middle letters of each word in a sentence, leaving it still readable like this: Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't ...
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2answers
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Creating multiple files from a list

This piece of code is to get random samples from two String lists, pos and neg. Based on a ...
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318 views

Seeded array shuffle

This should be relatively simple, but I want to know if I've done the randomness bit correctly. ...
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1k views

random_iterator in C++

This is a small utility that permutes a C++ standard container without modifying the container being iterated: random_iterator.hpp ...
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Generate a list of 10,000 numbers in random order

I am in the middle of an interview process with a company I am very excited about. The position is for a Junior Developer for C# applications. I have a year of experience at my current position as ...
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Shuffling chunks of ints in an array

The shuffle method in ShuffleMethods.java takes an array of ints and shuffles them by chunks of ints in another array. So for example, if we had an array of ints ...
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246 views

Helper method to shuffle cards list for online gaming

I have written this code to shuffle a deck of cards. I would like to hear your inputs. ...
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4k views

Two ways to randomly shuffle cards

Here are two implementations I wrote to randomly shuffle cards. The first method (shuffle) selects a random card, then swaps it to the front. The second method (<...
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852 views

Display four random entries from an array

This code will take the array shown and display 4 random entries in the format shown (or near enough). Are there any parts of this that can be optimised? I'm not happy about the ...
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Shuffle data simulation

Is the following procedure good for shuffling data in general (not just for JavaScript)? ...
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2answers
1k views

Deck shuffle and drawing cards

I developed a simple deck shuffle and drawing system, as a test on how to use collections and learn from it. However, I think my code is a bit wonky, and I think here is the best place to get new ...
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40 views

Shuffling many collections by folding over a numeric range

Often, I find myself folding over a range object if I need to repeatedly transform something. This, to me though, feels like an abuse of ...
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687 views

Shuffles male or females names based on Fisher Yates algorthim

The code below has many Lists<> but I'm not sure how to modify it. The only thing here that is an algorithm is the Fisher Yates shuffle algorithm. I am trying ...
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Generating random numbers and decks of cards

So I have some code here: First a simple random # generator and a array-choosing function: ...
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3k views

Fisher–Yates shuffle in C#

Is this a proper C# implementation of the Fisher–Yates shuffle? ...
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1answer
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Tetris random piece generator

I was inspired by this Reddit /r/dailyprogrammer challenge: Contrary to popular belief, the tetromino pieces you are given in a game of Tetris are not randomly selected. Instead, all seven pieces ...
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C# Card Shuffle

So, I took a stab at the ole C# Card Shuffle. I wanted to create my own genuine solution rather than copy someone else's. Any advice? ...
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1answer
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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 ...
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40 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 ...
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557 views

Shuffle array without duplicates

I made a function about random backgrounds And those images will unique as possible. (Shuffle again after all gone) My steps is : Setup the array Shuffle it Do function (check if ...
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1answer
813 views

Corrupting Java arithmetic through reflection

Inspired by a PPCG answer, I wrote this code, which shuffles the autoboxing caches of Number subclasses. This leads to, among other things, outputting ...
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1answer
61 views

Comparing two shuffling methods

I'm trying to randomly shuffle an collection of integers within a List and I have came up with two shuffling method that does the job. However, I'm not sure which ...
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6k views

Logic for shuffling sliding puzzle

I'm working on a sliding puzzle, one little project as a hobby, and yesterday I thought that instead of working on an algorithm to figure out a solved puzzle, it would be easier to make an algorithm ...
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1answer
2k views

Round Robin Tournament

RoundRobin is an implementation of the Round-robin style tournament: ...
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1answer
42 views

Create a collection of binaries with random set positions

I would like to create a collection of binaries with n set bits and total length should be between n and 31; also those set bits ...