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Home > Art, Film & Photography > Selection Algorithms Selection Algorithms: Selection Algorithm, Quickselect, Bfprt Selection Algorithm, Quickselect, Bfprt
Selection Algorithms Selection Algorithms: Selection Algorithm, Quickselect, Bfprt Selection Algorithm, Quickselect, Bfprt

Selection Algorithms Selection Algorithms: Selection Algorithm, Quickselect, Bfprt Selection Algorithm, Quickselect, Bfprt


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About the Book

Chapters: Selection Algorithm, Quickselect, Bfprt. Source: Wikipedia. Pages: 56. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: In computer science, a selection algorithm is an algorithm for finding the kth smallest number in a list (such a number is called the kth order statistic). This includes the cases of finding the minimum, maximum, and median elements. There are, worst-case linear time, selection algorithms. Selection is a subproblem of more complex problems like the nearest neighbor problem and shortest path problems. The term "selection" is used in other contexts in computer science, including the stage of a genetic algorithm in which genomes are chosen from a population for later breeding; see Selection (genetic algorithm). This article addresses only the problem of determining order statistics. Selection can be reduced to sorting by sorting the list and then extracting the desired element. This method is efficient when many selections need to be made from a list, in which case only one initial, expensive sort is needed, followed by many cheap extraction operations. In general, this method requires O(n logn) time, where n is the length of the list. Linear time algorithms to find minimums or maximums work by iterating over the list and keeping track of the minimum or maximum element so far. Using the same ideas used in minimum/maximum algorithms, we can construct a simple, but inefficient general algorithm for finding the kth smallest or kth largest item in a list, requiring O(kn) time, which is effective when k is small. To accomplish this, we simply find the most extreme value and move it to the beginning until we reach our desired index. This can be seen as an incomplete selection sort. Here is the minimum-based algorithm: function select(list, k) for i from 1 to k minIndex =...More: http: //booksllc.net/?id=552786


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Product Details
  • ISBN-13: 9781158476183
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Selection Algorithm, Quickselect, Bfprt Selection Algorithm, Quickselect, Bfprt
  • Width: 229 mm
  • ISBN-10: 1158476183
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 95 gr


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