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: i have a NSDictionary which looks like: { "Item1" = 2.4; "Item2" = 5.5; "Item3" = 15.6; } To use this NSDictionary Items in a Table View i have to transfer it to a NSArray , am i right? So i try: NSDictionary *dict = [myDict objectForKey:@"items"]; for (id item in dict) { [_myArray addObject:[dict objectForKey:item]]; } But _myArray keeps empty? What am i doing wrong? 回答1: Leaving aside the technical issues with the code you posted, you asked this: To use this Dictionary Items in a Table View i have to transfer it to a NSArray, am i right?

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've been tasked with creating a method that will print all the indices where value x is found in a sorted array. I understand that if we just scanned through the array from 0 to N (length of array) it would have a running time of O(n) worst case. Since the array that will be passed into the method will be sorted, I'm assuming that I can take advantage of using a Binary Search since this will be O(log n). However, this only works if the array has unique values. Since the Binary Search will finish after the first "find" of a particular value.

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 use Twig and I have an array with key like this : array[1] = "alpha" array[2] = "bravo" array[3] = "charlie" array[8] = "delta" array[9] = "echo" And I would like to get the key (1,2,3,8,9) and the content (alpha, bravo, charlie, delta, echo) in a loop to get all value of this array. How I can do this ? Thank you 回答1: I found the answer : {% for key,value in array_path %} Key : {{ key }} Value : {{ value }} {% endfor %} 回答2: There's this example in the SensioLab page on the for tag: Members {% for key, user in users %} {{ key }}: {{ user

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: func getIndex<T: Equatable>(valueToFind: T) -> Int? {...} mutating func replaceObjectWithObject<T: Equatable>(obj1: T, obj2: T) { if let index = self.getIndex(obj1) { self.removeAtIndex(index) self.insert(obj2, atIndex: index) // Error here: 'T' is not convertible to 'T' } } I have that function which is suppose to replace an element with another element. But Im not very familiar with Generics and don't know why this is not working. Please help. If I remove the Equatable from the mutating func the error message jumps to the first line in

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 is the reason for this weirdness in numpy's all ? >>> import numpy as np >>> np.all(xrange(10)) False >>> np.all(i for i in xrange(10)) True 回答1: Numpy.all does not understands generator expressions. From the documentation numpy.all(a, axis=None, out=None) Test whether all array elements along a given axis evaluate to True. Parameters : a : array_like Input array or object that can be converted to an array. Ok, not very explicit, so lets look at the code def all(a,axis=None, out=None): try: all = a.all except AttributeError: return

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 is the following code doing? int g[] = {9,8}; int (*j) = g; From my understanding its creating a pointer to an array of 2 ints. But then why does this work: int x = j[0]; and this not work: int x = (*j)[0]; 回答1: The parenthesis are superfluous in your example. The pointer doesn't care whether there's an array involved - it only knows that its pointing to an int int g[] = {9,8}; int (*j) = g; could also be rewritten as int g[] = {9,8}; int *j = g; which could also be rewritten as int g[] = {9,8}; int *j = &g[0]; a pointer-to-an-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: I have an array of seats, and the array has two strings(selected and empty). On mouse click, I want to traverse the array and find the selected seat. When I press the button it says: The final local variable seatno cannot be assigned, since it is defined in an enclosing type. JButton btnContinue = new JButton("Next"); btnContinue.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent arg0) { for(int x=0;x 回答1: The point is that method-local variables from the enclosing type are actually copied to instances of anonymous

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 know this question has been asked a lot, but I'm still unclear how to access the structs. I want to make a global pointer to an array of structs: typdef struct test { int obj1; int obj2; } test_t; extern test_t array_t1[1024]; extern test_t array_t2[1024]; extern test_t array_t3[1025]; extern test_t *test_array_ptr; int main(void) { test_array_ptr = array_t1; test_t new_struct = {0, 0}; (*test_array_ptr)[0] = new_struct; } But it gives me warnings. How should I access the specific structs with [] ? Similarly, how should I create an 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: I hope I can make myself clear in English and in what I want to create. I first start with what I want. I want to make a IBANcalculator that can generate 1-n IBANnumbers and also validate a given IBANnumber. IBANnumbers are used in many countries for payment and the tool I want to make can be used to generate the numbers for testing purpose. On wikipedia (Dutch site) I found a list with countries and their way of defining the IBANnumber. What I want to do it to make a kind of an array that holds all the countries with their name, the code,

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: Consider the following code: class myarray { int i; public: myarray(int a) : i(a){ } } How can you create an array of objects of myarray on the stack and how can you create an array of objects on the heap? 回答1: You can create an array of objects on the stack via: myarray stackArray[100]; // 100 objects And on the heap (or "freestore"): myarray* heapArray = new myarray[100]; delete [] heapArray; // when you're done But it's best not manage memory yourself. Instead, use a std::vector : #include <vector> std::vector<myarray> bestArray(100); A