Tutorial by Examples: t

R contains a Date class, which is created with as.Date(), which takes a string or vector of strings, and if the date is not in ISO 8601 date format YYYY-MM-DD, a formatting string of strptime-style tokens. as.Date('2016-08-01') # in ISO format, so does not require formatting string ## [1] &quot...

A common mistake is to hide an indexed column inside a function call. For example, this can't be helped by an index: WHERE DATE(dt) = '2000-01-01' Instead, given INDEX(dt) then these may use the index: WHERE dt = '2000-01-01' -- if `dt` is datatype `DATE` This works for DATE, DATETIME, TIM...

Create a testing class in the src/test/scala directory, in a file named HelloWorldSpec.scala. Put this inside the file: import org.scalatest.{FlatSpec, Matchers} class HelloWorldSpec extends FlatSpec with Matchers { "Hello World" should "not be an empty String" in { ...

Detailed instructions on getting cloudkit set up or installed.

import { NgModule } from '@angular/core'; @NgModule({ declarations: [], // components your module owns. imports: [], // other modules your module needs. providers: [], // providers available to your module. bootstrap: [] // bootstrap this root component. }) export class MyModule {} ...

// app.module.ts import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { HttpModule } from '@angular/http'; import { MyRootComponent } from './app.component'; @NgModule({ declarations: [MyRootComponent], imports: [BrowserModule, Ht...

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { MyModule } from './app.module'; platformBrowserDynamic().bootstrapModule( MyModule ); In this example, MyModule is the module containing your root component. By bootstrapping MyModule your Angul...

This example has two parts - some boilerplate steps for adding Castle Windsor to your WCF service, and then a simple, concrete example to show how we configure and use Windsor's container. That makes the example a little bit long. If you already understand using a DI container then you likely only ...

Prototype: aggregate(zeroValue, seqOp, combOp) Description: aggregate() lets you take an RDD and generate a single value that is of a different type than what was stored in the original RDD. Parameters: zeroValue: The initialization value, for your result, in the desired format. seqOp: ...

Helper yii\helpers\Url provides a set of static methods for managing URLs. This helper may used in views/controllers code. URL to a route: echo Url::to(['post/index']); URL to a route with parameters: echo Url::to(['post/view', 'id' => 100]); anchored URL: echo Url::to(['post/view', 'id...

/** * Checks if a resource exists by sending a HEAD-Request. * @param url The url of a resource which has to be checked. * @return true if the response code is 200 OK. */ public static final boolean checkIfResourceExists(URL url) throws IOException { HttpURLConnection conn = (HttpURLCo...

Let's say you're working on an app called MyTasks, and you want to allow inbound URLs to create a new task with a title and a body. The URL you're designing might look something like this: mytasks://create?title=hello&body=world (Of course, the text and body parameters are used to populate our...

Sometimes we need to perform basic operations like hide/show view based on single value, for that single variable we cannot create model or it is not good practice to create model for that. DataBinding supports basic datatypes to perform those oprations. <layout xmlns:android="http://schema...

First Initialize FirebaseDatabase: FirebaseDatabase database = FirebaseDatabase.getInstance(); Write to your database: // Write a message to the database FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRef....

ACCEPT variable. ACCEPT variable FROM CONSOLE. ACCEPT variable FROM ENVIRONMENT "path". ACCEPT variable FROM COMMAND-LINE. ACCEPT variable FROM ARGUMENT-NUMBER ACCEPT variable FROM ARGUMENT-VALUE ACCEPT variable AT 0101. ACCEPT screen-variable. ACCEPT today FROM DATE. ACCE...

NIO appeared in Java 1.4 and introduced the concept of "Channels", which are supposed to be faster than regular I/O. Network-wise, the SelectableChannel is the most interesting as it allows to monitor different states of the Channel. It works in a similar manner as the C select() system ca...

It is very common to get a StackOverflowError error while calling recursive function. Scala standard library offers TailCall to avoid stack overflow by using heap objects and continuations to store the local state of the recursion. Two examples from the scaladoc of TailCalls import scala.util.cont...

NSLog is good, but you can also log by appending to a file instead, using code like: NSFileHandle* fh = [NSFileHandle fileHandleForWritingAtPath:path]; if ( !fh ) { [[NSFileManager defaultManager] createFileAtPath:path contents:nil attributes:nil]; fh = [NSFileHandle fileHandleForWriting...

C# allows using pointer variables in a function of code block when it is marked by the unsafe modifier. The unsafe code or the unmanaged code is a code block that uses a pointer variable. A pointer is a variable whose value is the address of another variable i.e., the direct address of the memory l...

You can retrieve the data stored at the located referenced by the pointer variable, using the ToString() method. The following example demonstrates this: using System; namespace UnsafeCodeApplication { class Program { public static void Main() { unsafe { ...