sorting

问题 I have the following data frame head(stockdatareturnpercent) SPY DIA IWM SMH OIH 2001-04-02 8.1985485 7.8349806 7.935566 21.223832 13.975655 2001-05-01 -0.5621328 1.7198760 2.141846 -10.904936 -4.565291 2001-06-01 -2.6957979 -3.5838102 2.786250 4.671762 -23.241009 2001-07-02 -1.0248091 -0.1997433 -5.725078 -3.354391 -9.161594 2001-08-01 -6.1165559 -5.0276558 -2.461728 -6.218129 -13.956695 2001-09-04 -8.8900629 -12.2663267 -15.760037 -39.321172 -16.902913 Actually there are more stocks but for

问题 I have the following data frame head(stockdatareturnpercent) SPY DIA IWM SMH OIH 2001-04-02 8.1985485 7.8349806 7.935566 21.223832 13.975655 2001-05-01 -0.5621328 1.7198760 2.141846 -10.904936 -4.565291 2001-06-01 -2.6957979 -3.5838102 2.786250 4.671762 -23.241009 2001-07-02 -1.0248091 -0.1997433 -5.725078 -3.354391 -9.161594 2001-08-01 -6.1165559 -5.0276558 -2.461728 -6.218129 -13.956695 2001-09-04 -8.8900629 -12.2663267 -15.760037 -39.321172 -16.902913 Actually there are more stocks but for

问题 I have to make a telephone directory program. The program should read names and numbers from a file. I have successfully created a linked list containing this data. Now I want to sort them alphabetically. How should I do that? 回答1: It depends on your objective. If you want to do this efficiently, stick pointers to every element into an array, and then sort the array alphabetically using an algorithm like quicksort ( qsort in C); lastly, re-create the list from the sorted array. On the other

问题 I'm having a problem and believe something simple, just can't get a grip on it. I have a View model for my data context of the window. On it I have a private "DataTable" that is populated from a database query. No problem. I have a public DataView property {get;set;} that returns the DataTable.DefaultView. I bind the DataGrid on the form to the path of the DataView property on the view model and run the form. No problem, comes up, columns displayed properly, click on the rows, no problem. Now

问题 As generally known, sort() callback function is supposed to return -1, 0 or 1, depending on how its arguments compare. Despite this, I often see sort callbacks written in the following way: someArray.sort(function(a, b) { return a > b }) Although this obviously doesn't conform the specs, since the callback only returns 0 or 1, it still seems to produce correct results: a = [] for(i = 0; i < 1000; i++) a.push(Math.floor(Math.random() * 1000)) console.log(a.sort(function(a, b) { return a > b })

问题 I've been trying to find a way to even search for this without much luck. Basically, I've got a text field in a table. All I'm trying to do is check if that text field contains a particular string, in this case, if this field contains either "OLD", "OBSOLETE", or "FOM" and then move it to the very bottom of the list, leaving everything else sorted normally. Is this possible? I'm trying to do this without hitting the SQL Statement itself too much if at all. 回答1: You can do this by using a

问题 I have written some code for sorting random integers that a user inputted. How would I switch this into sorting randomly inputted letters? Aka, user inputs j, s, g, w, and the programs outputs g, j, s, w? for (int i = 0; i < random.length; i++) { //"random" is array with stored integers // Assume first value is x x = i; for (int j = i + 1; j < random.length; j++) { //find smallest value in array (random) if (random[j] < random[x]) { x = j; } } if (x != i) { //swap the values if not in correct

问题 This question already has answers here : How can I sort arrays and data in PHP? (11 answers) Closed 3 years ago . I have an array like this: array:6 [▼ "2016-07-28" => array:18 [▶] "2016-07-29" => array:18 [▶] "2016-07-30" => array:5 [▶] "2016-07-31" => array:5 [▶] "2016-08-01" => array:17 [▶] "2016-08-02" => array:11 [▶] ] I know want to revert the order, having 2016-08-02 the first and 2016-07-28 the last entry. I tried asort($missingArr); Result array:6 [▼ "2016-07-29" => array:18 [▶]

问题 I have a two dimensional array that is holding the value of 5 cards. The first element of each of the 5 arrays represents the suit of the card, and the second element represents the card value. I want to sort the 2d array by the second element, and then by the first element while maintaining the sorted order of the second element (if that makes sense). For example all suits of ones will be lower on the sorted list than all suits of two. So for example, {{0,1},{2,1},{0,2}} should become {{0,1}

问题 I have a two dimensional array that is holding the value of 5 cards. The first element of each of the 5 arrays represents the suit of the card, and the second element represents the card value. I want to sort the 2d array by the second element, and then by the first element while maintaining the sorted order of the second element (if that makes sense). For example all suits of ones will be lower on the sorted list than all suits of two. So for example, {{0,1},{2,1},{0,2}} should become {{0,1}