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Category Archives: algorithms
Find a Ducci sequence in C#
A Ducci sequence is a sequence of tuples of integers. You start with a sequence of values such as 1-2-3-4-5. TO find the next tuple, you calculate the absolute value of the difference between adjacent numbers in the sequence, wrapping … Continue reading
Posted in algorithms, mathematics
Tagged algorithms, C#, C# programming, differences, diffy game, Ducci sequence, example, example program, mathematics, Windows Forms programming
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Graph points in WPF and C#
This example extends the previous example Draw a graph in WPF and C# to draw ellipses marking the data sets’ points. See that example for an explanation of how most of the program works. The following code shows how the … Continue reading
Posted in algorithms, drawing, geometry, graphics, mathematics, wpf
Tagged algorithms, C#, C# programming, draw graph, draw graph in WPF, drawing, example, example program, geometry, GeometryGroup, graph, graph points, graphics, LineGeometry, mathematics, Polyline, Windows Forms programming, WPF, XAML
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Draw rose curves in C#
A rose curve is a curve generated by the polar coordinate equation r = cos(n / d * θ). Here n and d should be relatively prime, so the fraction n / d cannot be simplified. When you click the … Continue reading
Posted in algorithms, drawing, graphics, mathematics
Tagged algorithms, C#, C# programming, drawing, example, example program, graphics. mathematics, rose curves, Windows Forms programming
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Find two sets where the median of one is the mean of the other and vice versa in C#
For an upcoming book, I wanted to find sets where the mean (average) of one is the median (middle value) of the other and vice versa. I wanted to avoid trivial examples such as {1, 1, 1} and where the … Continue reading
Posted in algorithms, combinatorics
Tagged algorithms, C#, C# programming, combinatorics, example, example program, mean, median, sets, statistics, Windows Forms programming
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Find Mersenne primes in C#
Mersenne primes are prime numbers of the from 2n – 1 for some integer n. For example, 22 – 1 = 4 – 1 = 3 and 3 is prime, so 3 is a Mersenne prime. This example uses a … Continue reading
Posted in algorithms, mathematics
Tagged algorithms, C#, C# programming, example, example program, mathematics, Mersenne primes, prime numbers, primes, Windows Forms programming
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Convert between ragged arrays and two-dimensional arrays
Ragged arrays are arrays that hold other arrays, as opposed to two-dimensional arrays. They are called “ragged arrays” because they work like two-dimensional arrays (or higher-dimensional arrays) where each row in the array can hold a different number of elements. … Continue reading
Perform image hashing in C#
Image hashing or (perceptual image hashing) attempts to reduce an image to a concise code that represents the image so you can compare it to other images to see if they are the same. This example uses a difference hash … Continue reading
Posted in algorithms, graphics, image processing
Tagged algorithms, C#, C# programming, example, example program, graphics, image processing, Windows Forms programming
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Draw the spiral of Theodorus in C#
The spiral of Theodorus (which is also called the square root spiral, Einstein spiral, and Pythagorean spiral) was first devised by the Greek mathematician Theodorus of Cyrene during the 5th century BC. The spiral consists of a sequence of right … Continue reading
Add LINQ to autocomplete in C#
This example adds LINQ to the example Improve autocomplete suggestion in C#. It adds LINQ in two places: when it loads the list of words and when the program searches for the best matches that begin with a particular letter. … Continue reading
Improve autocomplete suggestion in C#
This example improves on the example Suggest autocomplete words in C#. The previous example loads all of its words into a big array. Then, to find the words that start with a particular letter, the program uses a binary search … Continue reading