sorting

问题 We're currently using the slick.remotemodel.js model implementation of SlickGrid for its remote Ajax loading functionality. With this example the only filtering provided is a simple Search element. What we're looking to accomplish is a much more robust filtering method of each column, such as what is used in this example: http://mleibman.github.com/SlickGrid/examples/example-header-row.html Is there a way to easily combine the features of the Dataview model with the RemoteModel? Is it merely

问题 I have a QTreeWidget with a column filled with some numbers, how can I sort them? If I use setSortingEnabled(true); I can sort correctly only strings, so my column is sorted: 1 10 100 2 20 200 but this is not the thing I want! Suggestions? 回答1: You can sort overriding the < operator and changing sort condiction like this. class TreeWidgetItem : public QTreeWidgetItem { public: TreeWidgetItem(QTreeWidget* parent):QTreeWidgetItem(parent){} private: bool operator<(const QTreeWidgetItem &other

问题 I have an array of edges, which is defined as a C-style array of doubles, where every 4 doubles define an edge, like this: double *p = ...; printf("edge1: %lf %lf %lf %lf\n", p[0], p[1], p[2], p[3]); printf("edge2: %lf %lf %lf %lf\n", p[4], p[5], p[6], p[7]); So I want to use std::sort() to sort it by edge length. If it was a struct Edge { double x1, y1, x2, y2; }; Edge *p; , I would be good to go. But in this case, the double array has a block size that is not expressed by the pointer type.

问题 I have an array of edges, which is defined as a C-style array of doubles, where every 4 doubles define an edge, like this: double *p = ...; printf("edge1: %lf %lf %lf %lf\n", p[0], p[1], p[2], p[3]); printf("edge2: %lf %lf %lf %lf\n", p[4], p[5], p[6], p[7]); So I want to use std::sort() to sort it by edge length. If it was a struct Edge { double x1, y1, x2, y2; }; Edge *p; , I would be good to go. But in this case, the double array has a block size that is not expressed by the pointer type.

问题 This is a best practice question. I've only seen the Perl spaceship operator (<=>) used in numeric sort routines. But it seems useful in other situations. I just can't think of a practical use. Can anyone give me an example of when it could be used outside of a Perl sort? 回答1: I'm writing a control system for robot Joe that wants to go to robot Mary and recharge her. They move along the integer points on the line. Joe starts at $j and can walk 1 meter in any direction per time unit. Mary

问题 This is a best practice question. I've only seen the Perl spaceship operator (<=>) used in numeric sort routines. But it seems useful in other situations. I just can't think of a practical use. Can anyone give me an example of when it could be used outside of a Perl sort? 回答1: I'm writing a control system for robot Joe that wants to go to robot Mary and recharge her. They move along the integer points on the line. Joe starts at $j and can walk 1 meter in any direction per time unit. Mary

问题 This is a best practice question. I've only seen the Perl spaceship operator (<=>) used in numeric sort routines. But it seems useful in other situations. I just can't think of a practical use. Can anyone give me an example of when it could be used outside of a Perl sort? 回答1: I'm writing a control system for robot Joe that wants to go to robot Mary and recharge her. They move along the integer points on the line. Joe starts at $j and can walk 1 meter in any direction per time unit. Mary

问题 I'm learning sorting algorithms and as next step, I'm trying to get my implementation perform close to the std::sort() . I'm pretty far, so far.. :-) I have 3 implementations of quicksort: standard quicksort (using temp arrays). quicksort with following optimizations: median3 used to select median tail-recursion quicksort applied only upto partition sizes < 16. For smaller partitions insertion sort is used. insertion sort applied to the whole array at once instead of applying to each

问题 I'm learning sorting algorithms and as next step, I'm trying to get my implementation perform close to the std::sort() . I'm pretty far, so far.. :-) I have 3 implementations of quicksort: standard quicksort (using temp arrays). quicksort with following optimizations: median3 used to select median tail-recursion quicksort applied only upto partition sizes < 16. For smaller partitions insertion sort is used. insertion sort applied to the whole array at once instead of applying to each

问题 I'm trying to sort a big table stored in a file. The format of the file is (ID, intValue) The data is sorted by ID , but what I need is to sort the data using the intValue , in descending order. For example ID | IntValue 1 | 3 2 | 24 3 | 44 4 | 2 to this table ID | IntValue 3 | 44 2 | 24 1 | 3 4 | 2 How can I use the Linux sort command to do the operation? Or do you recommend another way? 回答1: How can I use the Linux sort command to do the operation? Or do you recommend another way? As others