Tutorial by Examples: r

The SAVEQUERIES definition saves the database queries to an array and that array can be displayed to help analyze those queries. The constant defined as true causes each query to be saved, how long that query took to execute, and what function called it. NOTE: This will have a performance impact on...

The following code, inserted in your wp-config.php file, will log all errors, notices, and warnings to a file called debug.log in the wp-content directory. It will also hide the errors so they do not interrupt page generation. // Enable WP_DEBUG mode define( 'WP_DEBUG', true ); // Enable Debug...

:wqall Exiting multiple files with saving contents :qall! Exiting multiple files without saving contents

Once you have installed Visual Studio from https://www.visualstudio.com/downloads/, start a new project. Select 'Windows Forms Application' from Visual Basic Tab. You can rename it here if you need to. Once you click 'OK', you will see this window: Click on the 'Toolbo...

Bridge Mode $ docker run –d –-name my_app -p 10000:80 image_name Note that we did not have to specify --net=bridge because this is the default working mode for docker. This allows to run multiple containers to run on same host without any assignment of dynamic port. So BRIDGE mode avoids the por...

Dialog dlg; DialogGroup dGrp; DialogField dfName; dlg = new Dialog("Trivial Dialog"); dGrp = dlg.addGroup("A Group"); dfName = dlg.addField(extendedTypeStr(Name)); if (dlg.run()) { info(dfName.value()); } Extended data types have to be wrapped in a call to ext...

Dialog dlg; DialogGroup dGrp; DialogField dialogField; dlg = new Dialog("Evil Dialog"); dGrp = dlg.addGroup("A Group"); dialogField = dlg.addFieldValue(extendedTypeStr(NoYesId), NoYes::Yes, "I hereby sell my soul"); if (dlg.run()) { info(dialogField.valu...

Analysis in elasticsearch comes into context when you are willing to analyze the data in your index. Analyzers allow us to perform following: Abbreviations Stemming Typo Handling We will be looking at each of them now. Abbreviations: Using analyzers, we can tell elasticsearch how to t...

The first example are keywords that have a special purpose in C++: the following is legal in C, but not C++. int class = 5 These errors are easy to fix: just rename the variable.

In C, pointers can be cast to a void*, which needs an explicit cast in C++. The following is illegal in C++, but legal in C: void* ptr; int* intptr = ptr; Adding an explicit cast makes this work, but can cause further issues.

In C++, you may not skip initializations with goto or switch. The following is valid in C, but not C++: goto foo; int skipped = 1; foo; These bugs may require redesign.

Detailed instructions on getting DotNetNuke set up or installed.

// db.js const mysql = require('mysql'); const pool = mysql.createPool({ connectionLimit : 10, host : 'example.org', user : 'bob', password : 'secret', database : 'my_db' }); module.export = { getConnection: (callback) => { retu...

Detailed instructions on getting sharedpreferences set up or installed.

Use below URL to get steps for download and install- https://www.r-bloggers.com/installing-and-starting-sparkr-locally-on-windows-os-and-rstudio-2/ Add the environment variable path for your 'Spark/bin', 'spark/bin' , R and Rstudio path. I have added below path (initials will vary based on where ...

Create a new rails app hello-world from command in Windows and Terminal in Linux. rails new hello-world Now move to new app directory cd hello-world Now generate a controller rails generate controller hello_world index Here index is the name of method in hello_world controller. You can c...

class Node(object): def __init__(self, val): self.l_child = None self.r_child = None self.val = val class BinarySearchTree(object): def insert(self, root, node): if root is None: return node if root.val < node.val: ...

Comparisons are functions in clojure. What that means in (2>1) is (> 2 1) in clojure. Here are all the comparison operators in clojure. Greater Than (> 2 1) ;; true (> 1 2) ;; false Less Than (< 2 1) ;; false Greater Than or Equal To (>= 2 1) ;; true (>= 2 ...

Detailed instructions on getting uicollectionview set up or installed.

An example configuration for a hub: java -jar selenium-server-standalone-<version>.jar -role hub -hubConfig hubConfig.json { "_comment" : "Configuration for Hub - hubConfig.json", "host": ip, "maxSessions": 5, "port": 4444...