Tutorial by Examples: r

Users may face the following issue: log4j:WARN No appenders could be found for logger (dao.hsqlmanager). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. One reason this can occur is if the log4j.prop...

After php 5.4. 5.5 and 5.6 this new mayor update came. The update comes with many new programming features, techniques and ways of writing code. Installing PHP 7 could be done in multiple ways. To install it for a localhost development like WAMP or XAMPP either check for software updates from their...

Before checking the specific syntax, let's take a look on how to setup your environment to load needed plugins. Setup To load data directly from ElasticSearch you need to download the elasticsearch-hadoop plugin. You have different ways to make it work, for a quick setup you can do the following. ...

section .data msg db 'Hello, world!', 0xA len equ $ - msg section .text global _main _main: mov rax, 0 ; This will be the current number mov rcx, 10 ; This will be the last number _loop: cmp rax, rcx jl .loopbody ; Jump to .loopbody if rax < rcx jge _e...

Different types of variables may be declared with special options. DATA: lv_string TYPE string, " standard declaration lv_char TYPE c, " declares a character variable of length 1 lv_char5(5) TYPE c, " declares a character variable of length 5 l_pa...

#lang scribble/manual @section{Introduction} First paragraph. Some text, some text, some text, some text, some text, some text. @section{More stuff} @subsection{This is a subsection} Second paragraph. More text, more text, more text, more text, more text, more text.

#lang scribble/manual @; Make sure that code highlighting recognises identifiers from my-package: ꩜require[@for-label[my-package]] @; Indicate which module is exporting the identifiers documented here. @defmodule[my-package] @defproc[(my-procedure [arg1 number?] [arg2 string?]) symbol?]{ ...

Add any JSR 303 implementation to your classpath. Popular one used is Hibernate validator from Hibernate. <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>4.2.0.Final</version> </dependen...

<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:gpxx = "http://www.garmin.com/xmlschemas/GpxExtensions/v3" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX...

In the following naive parallel merge sort example, std::async is used to launch multiple parallel merge_sort tasks. std::future is used to wait for the results and synchronize them: #include <iostream> using namespace std; void merge(int low,int mid,int high, vector<int>&num)...

Sometimes your description can get rather long. For instance irb -h lists on argument that reads: --context-mode n Set n[0-3] to method to create Binding Object, when new workspace was created It's not immediately clear how to support this. Most solutions require adjustin...

Referring to non-static members in initializer lists before the constructor has started executing can result in undefined behavior. This results since not all members are constructed at this time. From the standard draft: §12.7.1: For an object with a non-trivial constructor, referring to any no...

webpack-dev-server can proxy some requests to others servers. This might be useful for developing API client when you want to send requests to same domain. Proxy is configured via proxy parameter. Example configuration of dev server passing requests to /api to other service listening on port 8080 ...

Simple Codec Here to illustrate the working principle we can use simple encryption and decryption as follows. public static String encrypt(String input) { // Simple encryption, not very strong! return Base64.encodeToString(input.getBytes(), Base64.DEFAULT); } public static String dec...

For example, say below is the sample data in an Excel 'Test', Purchase_Date Customer_Name Price 05-05-2017 Adam 1075 06-05-2017 Noah 1093 07-05-2017 Peter 1072 08-05-2017 Louis 1101 09-05-2017 Zoe 1248 10-05-2017 Kevin 1045 11-05-2017 Messiah 1...

Simple Codec Here to illustrate the working principle we can use simple encryption and decryption as follows. public static String encrypt(String input) { // Simple encryption, not very strong! return Base64.encodeToString(input.getBytes(), Base64.DEFAULT); } public static String dec...

This is project directory. A service endpoint interface First we will create a service endpoint interface. The javax.jws.WebService @WebService annotation defines the class as a web service endpoint. import javax.jws.WebMethod; import javax.jws.WebService; import javax.jws.soap.SOAPBi...

The example below uses the input statement to read a value from a source (in this case the string 123) into a both a character destination and a numeric destination. data test; source = '123'; numeric_destination = input(source, best.); character_destination = input(source, $3.); run; ...

Crontab contains cron jobs, each related to a specific task. Cron jobs are composed of two parts, the cron expression, and a shell command to be run: * * * * * command/to/run Each field in the above expression * * * * * is an option for setting the schedule frequency. It is composed of minute,...

We have a Student table with SubjectId. Here the requirement is to concatenate based on subjectId. All SQL Server versions create table #yourstudent (subjectid int, studentname varchar(10)) insert into #yourstudent (subjectid, studentname) values ( 1 ,'Mary' ) ,( 1 ,'John' ...