Tag Archives: combinatorics

Book Errata Page: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is the errata page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. If you find mistakes, please post them here in the Leave a Reply box at the bottom of the page. … Continue reading →

Posted in .NET, algorithms, books, C#, C# programming | Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, threading, tips, tools, Windows Forms programming | 2 Comments

Book Discussion Page: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is a discussion page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. Please post questions, thoughts, and suggestions here in the “Leave a Reply” box at the bottom of the page. I … Continue reading →

Table of Contents: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is a brief summary of the book’s table of contents. Introduction Part I. Serialization 1. Read a CSV File into an Array (1) 2. Use JSON to Serialize and Deserialize Objects (49) Part II. Graphing 3. Draw a Graph … Continue reading →

New Book: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

I’m happy to announce my latest book, The C# Helper Top 100, The 100 most popular posts at csharphelper.com. It describes the 100 most popular posts on the C# Helper web site. This is my 32nd book and my second … Continue reading →

Posted in .NET, algorithms, books, C#, C# programming | Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, The C# Helper Top 100, threading, tips, tools, Windows Forms programming | Leave a comment

Generate words of a given length in C#

Posted on August 5, 2016 by Rod Stephens

The example Generate three-letter words in C# uses three nested for loops to generate words that contain three letters. This example uses the following code to generate words of any given length. // Generate words with num_letters letters. private List … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, C#, C# programming, combinations, combinatorics, example, example program, generate words, letter combinations, mathematics, three-letter words, Windows Forms programming, words | 3 Comments

Generate three-letter words in C#

Posted on August 5, 2016 by Rod Stephens

This example uses the following very simple code to generate three-letter words using the letters a through z. // Make the items. private void Form1_Load(object sender, EventArgs e) { List<string> values = new List<string>(); for (char ch1 = ‘a’; ch1 … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, C#, C# programming, combinations, combinatorics, example, example program, letter combinations, three-letter words, Windows Forms programming, words | Leave a comment

Enumerate pairs of objects in arrays or IEnumerables in C#

Posted on March 4, 2015 by RodStephens

Sometimes it’s useful to enumerate pairs of objects in an array or enumerable. For example, if you have an array holding volleyball teams, the pairs would list each of the possible matches you could make. If the teams are A, … Continue reading →

Posted in arrays, combinatorics, extension methods | Tagged arrays, C#, C# programming, combinatorics, enumerate pairs, example, example program, extension methods, generate pairs, IEnumerable, list pairs, objects, pairs, Windows Forms programming | Leave a comment

Select N random items from an array in C#

Posted on January 12, 2015 by Rod Stephens

This example builds a generic extension method that lets you easily select N random objects from an array. For example, it lets you select 5 items from an array holding 10 names. Picking one random item from an array is … Continue reading →

Posted in algorithms, arrays, mathematics, variables | Tagged algorithms, arrays, C#, C# programming, choose, combinations, combinatorics, example, example program, mathematics, n choose m, pick, variables, Windows Forms programming | Leave a comment

Send secret Santa emails in C#

Posted on December 11, 2014 by RodStephens

This example shows how you can automatically send secret Santa emails for a party. The example Pick a secret Santa assignment in C# shows how you can quickly make secret Santa assignments. The post Calculate the number of secret Santa … Continue reading →

Posted in algorithms, combinatorics, mathematics | Tagged algorithms, C#, C# programming, combinatorics, derangements, email. send email, example, example program, mathematics, permutations, secret Santa, secret Santa permutations, selections, Windows Forms programming | Leave a comment

Calculate the number of secret Santa permutations in C#

Posted on December 9, 2014 by RodStephens

The example Pick a secret Santa assignment in C# picks a valid permutation of the people so no one is mapped to himself or herself. Such a permutation is called a derangement. See that example for details. The number of … Continue reading →