class

问题 I am reading an apache logfile using read.table and am wondering if it's somehow possible to apply a function (i.e. strptime ) while the data are being imported, instead of post-processing it. More details as requested: The column containing the date has the format: [10/Nov/2011:06:25:14 I can successfully parse it using: strptime(red[1,4],format="[%d/%b/%Y:%H:%M:%S") or as.POSIXct(strptime(red[1,4],format="[%d/%b/%Y:%H:%M:%S")) but as.POSIXct(red[1,4],format="[%d/%b/%Y:%H:%M:%S") fails.

问题 I'm trying to set off a function in my custom tableViewCell-class by using a function in my view controller. I'm really clueless on how to do this, so I tried writing it like this: TableViewCell.timerStarted() The function I'm trying to set off looks like this: func timerStarted(){ timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "update", userInfo: nil, repeats: true) } Where TableViewCell is the name of my class and timerStarted the name of the function. This gives

问题 import a class from theme directory outside of wordpress. The CRON I am cronning a daily job via Cpanel for my site that will feed a stats table. I created a file in the root Home/myDirectory (same level as public_html ) beloo is the code <?php include dirname(__FILE__) . '/public_html/wp-load.php'; // Load WP Functions include dirname(__FILE__) . '/public_html/wp-content/themes/cooking/config/Data/ViewsData.php'; // require a class function test(){ if(class_exists('ViewsData')){ $viewsData =

问题 I have just started programming some things with Greenfoot, learning java along the way. I have become familiar on how to call certain methods between classes, and also differences between static and non-static. I'm makeing a game where you play the crab and move around to collect worms. There is a lobster that randomly roams around and if comes in contact with the crab, the crab dissapears. Every time you eat a worm, the score goes up by 10. It contains 5 classes named Crab, Lobster, Worm,

问题 I have an array of strings like this: tableArray: { "Map", "Web", "Help" + 10 other strings} The array is used to build the table cells in a UITableViewController. When tapped I want the appropriate view controller to show, in the didSelectRowAtIndexPath method. Instead of creating a large switch, or if .. then .. else statement, can I somehow create the class name from the strings above, so that Map becomes MapViewController: MapViewController *detailViewController = [[MapViewController

问题 I am trying to use a variable from a method I created in another class in the main section. For example: public class test { public static int n; public void getLower(){ int p = 12; } public static void main(String[] args) { test example = new test(); example.getLower(); System.out.println(p); } } However, I get the error message 'p cannot be resolved to a variable'. Is what I'm trying to do possible? Thanks in advance! 回答1: p is a local variable within the getLower method. You're not

问题 If I have a pointer to a base class A in C++, how would I be able to tell in my code that the pointer is to a derived class B or C ? 回答1: Assuming the base class A is polymorphic (i.e. it has at least one virtual function), you can use dynamic_cast . Given an A* ap; : if (B* bp = dynamic_cast<B*>(ap)) { // the object is a B } else if (C* cp = dynamic_cast<C*>(ap)) { // the object is a C } 回答2: You generally shouldn't need to know: struct A { virtual int generate_foo() = 0; }; struct B : A {

问题 Confusing title? Sure! In CSS, you can specify: .button.blue { ... } Which will target elements that have both class names. Does anyone know what the browser support is? 回答1: I've never seen chaining of modifiers fail. I think you're good to go in all browsers still in use today, if not all browsers that ever implemented CSS. EDIT : Nope. Just watched IE6 choke on it. Plugged this example into Adobe Browserlab, and both the class attributes hello world and world respond to the .hello.world

问题 I have some html/jquery/css which I have combined to create a multiple choice style quiz, which is working quite well. When a user clicks on a choice, the choice list is replaced with the appropriate answer. I have added a working codepen link at the end of the question. I wish to identify the html contents of the most recently picked choice so that I can understand when a user has reached the end of their questions, and thus append a separate block of text, however, I am struggling to do

问题 I have some html/jquery/css which I have combined to create a multiple choice style quiz, which is working quite well. When a user clicks on a choice, the choice list is replaced with the appropriate answer. I have added a working codepen link at the end of the question. I wish to identify the html contents of the most recently picked choice so that I can understand when a user has reached the end of their questions, and thus append a separate block of text, however, I am struggling to do