Tutorial by Examples: nd

The interactive mode The most basic way to use R is the interactive mode. You type commands and immediately get the result from R. Using R as a calculator Start R by typing R at the command prompt of your operating system or by executing RGui on Windows. Below you can see a screenshot of an inter...

Each standard Oracle error is associated with an error number. Its important to anticipate what could go wrong in your code. Here for a connection to another database it can be: -28000 account is locked -28001 password expired -28002 grace period -1017 wrong user / password Here is a way to...

To illustrate this, here is a function that has 3 different "wrong" behaviors parameter is completely stupid: we use a user-defined expression parameter has a typo: we use Oracle standard NO_DATA_FOUND error another, but not handled case Feel free to adapt it to your standards: DE...

You can use the ng generate or ng g command to generate Angular building blocks (components, services, pipes, etc.). You can find all possible blueprints in the table below: ScaffoldUsageShortenedComponentng generate component component-nameng g c component-nameDirectiveng generate directive direc...

class MyToolbarControl { public: MyToolbarControl(HWND hWndToolbar, HWND hWndNotifyParent = nullptr) : _Handle(hWndToolbar) { if (hWndNotifyParent == nullptr) { hWndNotifyParent = GetAncestor(hWndToolbar, GA_ROOTOWNER); } SetWindowSubclass( ...

Example of usage: /* Instance of your custom APNs/local notification manager */ private var pushManager: AppleNotificationManager! Registration: func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) { // Called...

To enable Pull to Refresh in a ListView in Xamarin, you first need to specify that it is PullToRefresh enabled and then specify the name of the command you want to invoke upon the ListView being pulled: <ListView x:Name="itemListView" IsPullToRefreshEnabled="True" RefreshComm...

I'm in a controlled room with a single minew beacon that use IBEACON protocol. BLEController needs to extend CBPeripheralDelegate I'll use the first BLE to connect after the search has stop. Modify the method StopSearchBLE() class BLEController: CBCentralManagerDelegate, CBPeripheralDelegate...

HTML : <li class="item" ng-repeat="schedule in Schedules | filter:scheduleSearch | limitTo:numberOfItemsToDisplay"> Display some data </li> <ion-infinite-scroll on-infinite="addMoreItem()" ng-if="Schedules.length > numberOfItemsToDisplay&...

Assuming we have a working laravel application running in, say, "mylaravel.com",we want our application to show a "Hello World" message when we hit the URL http://mylaravel.com/helloworld . It involves the creation of two files (the view and the controller) and the modification o...

A common mistake is to forget surrounding compound function arguments with parentheses, leading to type errors. # string_of_int 1+1;; Error: This expression has type string but an expression was expected of type int This is because of the precedence. In fact, the above evaluates to # (string...

Unlike the VisibleExp property, defined in Aspx, you manipulate AllowSelect property of a data view though BLC or BLC extension code. The AllowSelect property makes it possible to use more complex boolean expressions (in comparison to the VisibleExp property) and, if necessary, retrieve additional i...

Note: The output.library and name (in DllPlugin) must be the same. const path = require('path'); const webpack = require('webpack'); const ExtractTextPlugin = require('extract-text-webpack-plugin'); const extractCSS = new ExtractTextPlugin('vendor.css'); const isDevelopment = process.env.NODE_E...

Note: manifest (in DllReferencePlugin) should reference path (defined in DllPlugin) const webpack = require('webpack'); const path = require('path'); const isDevelopment = process.env.NODE_ENV !== 'production'; const ExtractTextPlugin = require('extract-text-webpack-plugin'); const extractCSS...

Starting JShell Before trying to start JShell, make sure your JAVA_HOME environment variable points to a JDK 9 installation. To start JShell, run the following command: $ jshell If all goes well, you should see a jshell> prompt. Exiting JShell To exit JShell, run the following command from...

You can define methods and classes within JShell: jshell> void speak() { ...> System.out.println("hello"); ...> } jshell> class MyClass { ...> void doNothing() {} ...> } No access modifiers are necessary. As with other blocks, semicolons are require...

The DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items. DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(context, mLayoutManager.getOrientation()); recyclerView.addItemDecoration(mDividerItemDecoration); It su...

Android O changes the way to work with fonts. Android O introduces a new feature, called Fonts in XML, which allows you to use fonts as resources. This means, that there is no need to bundle fonts as assets. Fonts are now compiled in an R file and are automatically available in the system as a reso...

Drop/Delete your database If you are using SQLite for your database, just delete this file. If you are using MySQL/Postgres or any other database system, you will have to drop the database and then recreate a fresh database. You will now need to delete all the migrations file except "init.py...

To access complete schema of server db instead of single table. Follow below steps: Create EXTENSION : CREATE EXTENSION postgres_fdw; Create SERVER : CREATE SERVER server_name FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host 'host_ip', dbname 'db_name', port 'port_numb...