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The Largest Black Holes in the Universe

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Laboratory Equipment Multi-Agent Transport Simulation | MATSim Optics, Lasers, Imaging & Fiber Information Resource Ten 100-year predictions that came true 11 January 2012Last updated at 00:09 By Tom Geoghegan BBC News Magazine John Watkins predicted Americans would be taller, tanks would exist and C, X and Q would no longer feature in our everyday alphabet In 1900, an American civil engineer called John Elfreth Watkins made a number of predictions about what the world would be like in 2000. How did he do? As is customary at the start of a new year, the media have been full of predictions about what may happen in the months ahead. But a much longer forecast made in 1900 by a relatively unknown engineer has been recirculating in the past few days. In December of that year, at the start of the 20th Century, John Elfreth Watkins wrote a piece published on page eight of an American women's magazine, Ladies' Home Journal, entitled What May Happen in the Next Hundred Years. Watkins was a writer for the Journal's sister magazine, the Saturday Evening Post, based in Indianapolis. It was picked up and caused some excitement on Twitter. 1. 2. 3. 4. 5. 6.

The Society of Vacuum Coaters Is radix sort faster than quicksort for integer arrays? discussion at reddit There are plenty of misconceptions and confusion over radix sort on the internet. The wikipedia article is messy and unclear, and focuses more on trying to explain the philosophy (for lack of a better word) than the characteristics and capabilities of radix sort. American Flag Sort Worst case performance: O(kN) Worst case space complexity: O(k log N) In Engineering radix sort McIlroy et al. discusses how radix sort can be used successfully to sort arrays of strings, using the American Flag Sort variant. Implementation The implementation proved to be surprisingly simple. “The troubles with radix sort are inimplementation, not in conception” - McIlroy et al. (1993) The complexity is O(kN) with k = 4 for 32-bit integers. It's important to note that complexity analysis of e.g. quicksort assumes that each comparison is O(1), which isn't true in practice on real hardware nor correct in theory when considering variable sized elements. Benchmark sort Hardware: Language options:

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algorithm - In-Place Radix Sort Bioscience Technology Online Burstsort Burstsort algorithms use a trie to store prefixes of strings, with growable arrays of pointers as end nodes containing sorted, unique, suffixes (referred to as buckets). Some variants copy the string tails into the buckets. As the buckets grow beyond a predetermined threshold, the buckets are "burst", giving the sort its name. A more recent variant uses a bucket index with smaller sub-buckets to reduce memory usage. Most implementations delegate to multikey quicksort, an extension of three-way radix quicksort, to sort the contents of the buckets. By dividing the input into buckets with common prefixes, the sorting can be done in a cache-efficient manner.

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