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Monthly Archives: July 2018
Get a weather forecast from openweathermap.org in C#
This example displays a weather forecast from openweathermap.org. To get a forecast or other data, you build a URL describing your request and navigate to it. You then parse the returned XML or JSON data to see what openweathermap.org has … Continue reading
Posted in internet, web, XML
Tagged C#, C# programming, example, example program, forecasts, internet, JSON, weather, weather forecast, web, Windows Forms programming, XML
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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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Trim images in C#
This example shows how you can trim images to remove unnecessary whitespace around their edges. Sometimes when I make pictures for a book, it’s hard to tell where the edges of the picture begin, so I risk either including more … Continue reading
Posted in Uncategorized
Tagged Bitmap32, C#, C# programming, example, example program, graphics, image processing, trim images, 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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