sorting

问题 I have a multidimensional array which stores information about players in a game. It stores an array for each player, and each player is an array of information. One of the values in each player is an array of scores. I want to output my data to a table in order of highest total score to lowest. At the moment, the output is in no particular order. The only way I know of to get the total score is array_sum($allplayers[0][2]) or similar. How can I sort the array $allplayers so that when I loop

问题 I have an ArrayList where I store 10 objects with two random generated numbers each and I want to sort the list by the Y values of the objects. Random rndm = new Random(); ArrayList CustomList = new ArrayList(); for (int i = 0; i < 10; i++) { Point LP = new Point(rndm.Next(50), rndm.Next(50)); CustomList.Add(LP); } PrintList(CustomList); CustomList.Sort(); PrintList(CustomList); The Sort method throws the following exception: System.InvalidOperationException: The comparer threw an exception.

问题 I have input data on a cylindrical grid and want to plot them using slice in MATLAB. To do this I first transform the reference coordinates into Cartesian coordinates using pol2cart . r = linspace(1,4,4); phi = linspace(0,2*pi,10); z = linspace(1,3,3); [rmesh,phimesh,zmesh]=meshgrid(r,phi,z) [xmesh,ymesh,zmesh]=pol2cart(phimesh,rmesh,zmesh) When I use slice now (e.g. slice(xmesh,ymesh,zmesh,ones(10,4,3),2,2,2) ) an error is thrown, because the coordinate matrices are not ordered correctly (

问题 I have an array of numbers and I need to sort only part of it by left and right barriers. Can you please help me how to implement it correctly? const sortBetween = (arr, left, right) => { ... } given: [9,3,5,7,4,9,4,1] , left = 2, right = 5 expected: [9,3,4,5,7,9,4,1] [9,3, 5,7,4,9 ,4,1] -> [9,3, 4,5,7,9 ,4,1] Thanks for the help. 回答1: This is an approach by using sort directly, but shaping the access with a Proxy for length and the indices. type original array length ------- ----------------

问题 So I was working on this sorting algorithm in java, and was wondering if anybody has seen anything like this before. Specifically, this algorithm is meant to sort very large lists with a very small range of numbers. If you have seen that or have any suggestions to enhance the algorithm, can you say something about that below? I have the code here: public static int[] sort(int[] nums) { int lowest = Integer.MAX_VALUE; for (int n : nums) { if (n < lowest) lowest = n; } int index = 0; int down =

问题 I have a list as follows: i = [ {'id': '1', 'P': 0.5}, {'id': '2', 'P': 0.4}, {'id': '3', 'P': 0.8}, ... {'id': 'x', 'P': P(x)} ] When I do the following: i.sort(key=lambda x: x['P'], reverse=True) The list gets sorted based on P where the element with the largest P is in front. but what if I want to make it seem randomized so that even a element with a small P value (with very small probability) can be the first item in the list? Is it possible to implement that using the sort() function or

问题 I have an array where the Key is the sales person. The value of the key is an array, with 2 values: A percentage value, and a total value. In a nutshell, I am trying to sort the Highest percentage value on top. $sales = array( "Johnny Smith" => array(75.25,45), "Ash Han" => array(55.67, 99), "Janice K." => array(90.00, 40) ); I've tried a few arrangements or array sorting functions, and none are good enough to even display, since they don't have examples where the array value is an array to

问题 i have a collection of records as follows { "_id":417, "ptime":ISODate("2013-11-26T11:18:42.961Z"), "p":{ "type":"1", "txt":"test message" }, "users":[ { "uid":"52872ed59542f", "pt":ISODate("2013-11-26T11:18:42.961Z") }, { "uid":"524eb460986e4", "pt":ISODate("2013-11-26T11:18:42.961Z") }, { "uid":"524179060781e", "pt":ISODate("2013-11-27T12:48:35Z") } ], }, { "_id":418, "ptime":ISODate("2013-11-25T11:18:42.961Z"), "p":{ "type":"1", "txt":"test message 2" }, "users":[ { "uid":"524eb460986e4",

问题 In python, I wish to sort tuples based on the value of their last element. For example, i have a tuple like the one below. tuples = [(2,3),(5,7),(4,3,1),(6,3,5),(6,2),(8,9)] which after sort I wish to be in this format. tuples = [(4,3,1),(6,2),(2,3),(6,3,5),(5,7),(8,9)] How do i get to doing that? 回答1: Povide list.sort with an appropriate key function that returns the last element of a tuple: tuples.sort(key=lambda x: x[-1]) 回答2: You can use: from operator import itemgetter tuples = sorted

问题 I have a large pandas dataframe that can be represented structurally as: id date status 0 12 2015-05-01 0 1 12 2015-05-22 1 2 12 2015-05-14 1 3 12 2015-05-06 0 4 45 2015-05-03 1 5 45 2015-05-12 1 6 45 2015-05-02 0 7 51 2015-05-05 1 8 51 2015-05-01 0 9 51 2015-05-23 1 10 51 2015-05-17 1 11 51 2015-05-03 0 12 51 2015-05-05 0 13 76 2015-05-04 1 14 76 2015-05-22 1 15 76 2015-05-08 0 And can be created in Python 3.4 using: tempDF = pd.DataFrame({ 'id': [12,12,12,12,45,45,45,51,51,51,51,51,51,76,76