array

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I've got a class definition similar to the following: class UUID { public : // Using implicit copy assignment operator private : unsigned char buffer [ 16 ]; }; I've just had a unit test fail on me that was verifying that copy assignment worked properly. To my surprise, one byte in the middle of the buffer[] array was copied incorrectly. My understanding is that the default copy assignment operator performs memberwise copy, and that for array members (not pointer-to-array members) that entails elementwise copy of the array. Am I

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have to solve a little mpi problem. I have 4 slaves processes and each of these wants to send a 2d subarray (CHUNK_ROWS X CHUNK_COLUMNS) to master 0. Master 0 collects all chunks in ddd[ROWS][COLUMNS] and print it. I want to use MPI_Gather() #include #include using namespace std; #define ROWS 10 #define COLUMNS 10 #define CHUNK_ROWS 5 #define CHUNK_COLUMNS 5 #define TAG 0 int** alloca_matrice(int righe, int colonne) { int** matrice=NULL; int i; matrice = (int **)malloc(righe * sizeof(int*)); if(matrice != NULL){ matrice[0] = (int *)malloc

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm new to php and I have executed below code. my_value[] = $value; } function set_value ($value){ // Error occurred from here as Undefined variable: my_value $this->$my_value = $value; } } $a = new my_class ('a'); $a->my_value[] = 'b'; $a->set_value ('c'); $a->my_class('d'); foreach ($a->my_value as &$value) { echo $value; } ?> I got below errors. What could be the error? Notice: Undefined variable: my_value in C:\xampp\htdocs\MyTestPages\f.php on line 15 Fatal error: Cannot access empty property in C:\xampp\htdocs\MyTestPages\f.php on line

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Currently I am using this method to loop through every pixel, and insert a value into a 3D array based upon RGB values. I need this array for other parts of my program, however it is extraordinarily slow. When run on a 50 x 50 picture, it is almost instant, but as soon as you start getting into the hundreds x hundreds it takes a long time to the point where the app is useless. Anyone have any ideas on how to speed up my method? @IBAction func convertImage(sender: AnyObject) { if let image = myImageView.image { var pixelData =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to create 10 element array of unique random integers. However I am unable to create array with unique values. Is there in Julia something like Pythons sample function ? numbers = zeros(Array(Int64, 10)) rand!(1:100, numbers) Thanks. 回答1: There is a sample function in StatsBase: using StatsBase a = sample(1:100, 10, replace = false) This will draw a sample of length 10 from 1:100 without replacement. 回答2: If performance is not an issue (i.e. the sample range isn't too large, or the sample count is close to the sample range), and

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I noticed that arrays have the SetValue method, which seems a little out of place when you could just use the indexers. Is there some special purpose for SetValue? The MSDN article didn't seem to say what SetValue was for, just how to use it. Which method would be more efficient to use as far as speed goes? 回答1: Sometimes all you have of an array is that it's an Array . The Array class does not have indexers, so the best way to set/get element values on it is via the GetValue and SetValue methods. For example: private void M(Array array) {

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: A Tale of Two Functions I have one function that fills an array up to a specified value: function getNumberArray(maxValue) { const a = []; for (let i = 0; i < maxValue; i++) { a.push(i); } return a; } And a similar generator function that instead yields each value: function* getNumberGenerator(maxValue) { for (let i = 0; i < maxValue; i++) { yield i; } } Test Runner I've written this test for both these scenarios: function runTest(testName, numIterations, funcToTest) { console.log(`Running ${testName}...`); let dummyCalculation; const

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What does "bucket entries" mean in the context of a hashtable? 回答1: A bucket is simply a fast-access location (like an array index) that is the the result of the hash function. The idea with hashing is to turn a complex input value into a different value which can be used to rapidly extract or store data. Consider the following hash function for mapping people's names into street addresses. First take the lower-cased initials from the first and last name and turn them both into numeric values (0 through 25, from 'a' through 'z'). Multiply

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a correct way to document values/objects in arrays which are within another dimension? Normally an array will be handled like this: /** @var ClassName[] $Array */ $Array = array( $InstanceOfClassName,.. ) But i need something like this: /** @var ClassName[][] $Array */ $Array = array( 0 => array( $InstanceOfClassName,.. ) ) This is obviously not working, so what is the correct PHPDoc notation? 回答1: First, understand that this usage of @var is not standard phpDocumentor spec. It is one of several different ways that different IDEs

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: for some reasons, our hosting company used PHP 5.2 and doesn't even have mysqli and PDO pre-installed. I have no choice but to rewrite some part of my code to make it 5.2 compatible. so, here is my question: In PHP 5.2 Anonymous function is not supported, so i did the following test to make sure I'm changing the code correctly: class foo{ public function toString(){ $arr = array("a", "b"); $arr2 = array("c", "d"); print_r(array_map('mapKeyValue', $arr, $arr2)); } private function mapKeyValue($v, $k){ return $k."='".$v."'"; } } $foo = new foo