performance

问题 I have defined a custom object with multiple fields. For example say I have a Student object, which consists of a name, ID, and age. To compare two students and determine whether they are the same student or not, I implemented a __ eq__ method that will return whether the age, name, and ID of the two students match up. def __eq__(self, other): return self.name == other.name and self.ID == other.ID and self.age == other.age Bear in mind that the student is just an example, so the fact that

问题 The CompositionTarget.Rendering event is the perfect thing to build a game's main loop upon. It basically fires at the rate of vsync (usually 60 Hz). Occurs just before the objects in the composition tree are rendered. The Rendering event is routed to the specified event handler after animation and layout have been applied to the composition tree. The per-frame animation how-to article explains a little bit more. Note that your event handler method is called after layout has been computed.

问题 I'm making an application in which you edit a file, and it should append the edited file to zip archive and make it downloadable. It should be cross platform (Windows and Linux). My goal is to programmatically generate the edited file and append it to static archive (which is always the same, around 3-4MBs, but around 40-50 files). I've looked at the following post on how to zip archives in node.js, however the answer by Eliseo Soto is OS dependent. I've also found daraosn/node-zip, but as I

问题 In some html documents I'm using webfonts for only a couple of words. Performance-wise loading a complete font-file seems wasteful. This is where the unicode-range parameter of the @font-face declaration comes in: http://www.w3.org/TR/css3-fonts/#unicode-range-desc With it I supposedly can define what characters of the font-file to load, thus improving performance greatly. But I just can't get it to work. And the odd thing is that it diplays all the characters in firefox, and it fails to load

问题 I have encountered a great issue while using Laravel's datatables. I have a model that has 3 values automatically encrypted (using Crypt) by setter/getter. I am using datatables to render a table by doing so: return datatables()->of(Patient::query()) ->addColumn('name_surname', function($row){ return $row->name.' '.$row->surname; }) ->make(true); There is 3 ways to pass a model to datatable: by query (Patient::query()) by collection (Patient::all()) by DB facade The third doesnt decrypt data.

问题 I have 2 numpy arrays(say X and Y) which each row represents a point vector. I want to find the squared euclidean distances(will call this 'dist') between each point in X to each point in Y. I want to the output to be a matrix D where D(i,j) is dist(X(i) , Y(j)). I have the following python code based on : http://nonconditional.com/2014/04/on-the-trick-for-computing-the-squared-euclidian-distances-between-two-sets-of-vectors/ def get_sq_distances(X, Y): a = np.sum(np.square(X),axis=1,keepdims

问题 I have added two listeners 1) View results in tree 2) jp@gc - Graphs Generator CSV is getting generated from 1st listener but 2nd listener is not generating any graphs even though all my path is correct 回答1: I stumbled across the same problem, here's the solution. Jmeter sometimes does not show the error count/message in the caution area at the top right corner of the GUI. I anyway went ahead and checked the log file, it seems that the error was java.lang.ClassNotFoundException:kg.apc.jmeter

问题 I have added two listeners 1) View results in tree 2) jp@gc - Graphs Generator CSV is getting generated from 1st listener but 2nd listener is not generating any graphs even though all my path is correct 回答1: I stumbled across the same problem, here's the solution. Jmeter sometimes does not show the error count/message in the caution area at the top right corner of the GUI. I anyway went ahead and checked the log file, it seems that the error was java.lang.ClassNotFoundException:kg.apc.jmeter

问题 I have added two listeners 1) View results in tree 2) jp@gc - Graphs Generator CSV is getting generated from 1st listener but 2nd listener is not generating any graphs even though all my path is correct 回答1: I stumbled across the same problem, here's the solution. Jmeter sometimes does not show the error count/message in the caution area at the top right corner of the GUI. I anyway went ahead and checked the log file, it seems that the error was java.lang.ClassNotFoundException:kg.apc.jmeter

问题 I have a hive table with below structure ID string, Value string, year int, month int, day int, hour int, minute int This table is refreshed every 15 mins and it is partitioned with year/month/day/hour/minute columns. Please find below samples on partitions. year=2019/month=12/day=29/hour=19/minute=15 year=2019/month=12/day=30/hour=00/minute=45 year=2019/month=12/day=30/hour=08/minute=45 year=2019/month=12/day=30/hour=09/minute=30 year=2019/month=12/day=30/hour=09/minute=45 I want to select