Tag Archives: mathematics

Understand probabilities of unrelated events (and escaping zombies)

Posted on May 22, 2017 by Rod Stephens

Given some event with a relatively low probability, what is the probability that the event will occur if you perform many trials? For example, suppose the zombie apocalypse has arrived and there’s a 1% chance that the zombies will get … Continue reading →

Posted in mathematics | Tagged C#, C# programming, example, example program, mathematics, probabilities, probability, unrelated events, Windows Forms programming, zombies | Leave a comment

Use the yield statement in C#

Posted on April 13, 2017 by Rod Stephens

An enumeration is a sequence of values that a program can enumerate over, for example, by using a foreach loop. In C# you can use the yield statement to make a method that returns an enumeration. The method that builds … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, C#, C# programming, enumerate, enumeration, example, example program, iterators, mathematics, Sieve of Eratosthenes, Windows Forms programming, yield, yield return | Leave a comment

Make a sunburst chart in C#, Part 4

Posted on April 7, 2017 by RodStephens

The previous post showed how to make a sunburst chart with curved text. This example extends that one so it can draw multi-line text. The previous post used the DrawTextOnArc method to draw curved text. The text is a distance … Continue reading →

Posted in drawing, graphics, mathematics | Tagged angled text, C#, C# programming, charts, curved text, data analysis, drawing, example, example program, graphics, graphs, mathematics, MeasureCharacterRanges, multiline text, path text, rotated text, sunburst, sunburst chart, sunburst diagram, text that follows a path, Windows Forms programming | Leave a comment

Make a sunburst chart in C#, Part 3

Posted on April 6, 2017 by RodStephens

The post Make a sunburst chart in C#, Part 1 shows how to build a basic sunburst chart. The post Make a sunburst chart in C#, Part 2 enhances that example by drawing each node’s text at an angle so … Continue reading →

Posted in drawing, graphics, mathematics | Tagged angled text, C#, C# programming, charts, curved text, data analysis, drawing, example, example program, graphics, graphs, mathematics, MeasureCharacterRanges, path text, rotated text, sunburst, sunburst chart, sunburst diagram, text that follows a path, Windows Forms programming | 1 Comment

Make a sunburst chart in C#, Part 2

Posted on April 5, 2017 by RodStephens

The post Make a sunburst chart in C#, Part 1 explained how to build a simple sunburst chart. Unfortunately the node labels used by that chart didn’t fit their wedges very well because the text was all drawn horizontally. This … Continue reading →

Posted in drawing, graphics, mathematics | Tagged angled text, C#, C# programming, charts, data analysis, drawing, example, example program, graphics, graphs, mathematics, rotated text, sunburst, sunburst chart, sunburst diagram, Windows Forms programming | 2 Comments

Make a sunburst chart in C#, Part 1

Posted on April 4, 2017 by RodStephens

A sunburst chart displays hierarchical data in a circular diagram. The hierarchy’s root is drawn in the center. Its children sit in a ring around the root. After that, each node’s wedge in a ring is divided among its children … Continue reading →

Posted in drawing, graphics, mathematics | Tagged C#, C# programming, charts, data analysis, drawing, example, example program, graphics, graphs, mathematics, sunburst, sunburst chart, sunburst diagram, Windows Forms programming | 3 Comments

Use digits of Pi to draw a picture in C#

Posted on March 15, 2017 by RodStephens

The article 10 stunning images show the beauty hidden in pi shows several ways to use Pi to generate pictures. This example demonstrates one of them. The program starts drawing at the origin (0, 0). It then scans through the … Continue reading →

Posted in algorithms, drawing, graphics, mathematics, strings | Tagged algorithms, approximation, C#, C# programming, convergence, digits of Pi, drawing, error, example, example program, graphics, image of pi, mathematics, Pi, Pi Day, pi image, strings, Windows Forms programming | Leave a comment

Look for dates in the digits of Pi in C#

Posted on March 15, 2017 by RodStephens

The example Find patterns within pi in C# looks for patterns within the digits of Pi. You can use that example to look for dates such as 4/1. This example determines whether the first 100 thousand digits of Pi contains … Continue reading →

Posted in algorithms, mathematics, strings | Tagged algorithms, C#, C# programming, dates, dates in pi, digits of Pi, example, example program, mathematics, Pi, Pi Day, strings, Windows Forms programming | Leave a comment

Find patterns within Pi in C#

Posted on March 14, 2017 by RodStephens

March 14 is known as Pi Day because its numeric representation 3/14 includes the first three digits of Pi: 3.14. (At least in the United States. In Europe where they usually write dates month first, Pi Day is July 22 … Continue reading →

Posted in algorithms, mathematics, strings | Tagged algorithms, approximation, C#, C# programming, convergence, digits of Pi, error, example, example program, mathematics, Pi, Pi Day, strings, Windows Forms programming | 1 Comment

Use an improved extension method to calculate standard deviation in C#

Posted on March 8, 2017 by RodStephens

The example Calculate standard deviation in C# makes an extension method that calculates standard deviation for an IEnumerable of integers. Unfortunately because that example works with integers, it cannot work with other data types. Rian Meier showed me this method, … Continue reading →