Tutorial by Examples: io

To get general statistics about main components of Linux family of stat commands are extremely useful CPU To get processors related statistics you can use mpstat command but with some options it will provide better visibility: $ mpstat 2 10 Memory We all know command free to show amount of (r...

One can describe a line in the plane as y = a*x + b so that the line is essentially controlled by two parameters a, b. For a given line, the choice of these parameters is unique. But vertical lines cannot be described like this.

One can describe a line in arbitrary dimensions as X = A + t*D where A and D are both vectors of suitably many dimensions. So in 2d this would be x = Ax + t*Dx y = Ay + t*Dy Now as t assumes any real value, this equation will produce all points along the line. The representation is not uniq...

A line in the plane can be described as a*x + b*y + c = 0 This uses a three-element parameter vector [a, b, c] to describe the line. Sometimes the constant term c is moved to the right hand side of the equation instead. The representation is not unique, since the length of that vector is arbitra...

var alertResult = await DisplayAlert("Alert Title", Alert Message, null, "OK"); if(!alertResult) { //do your stuff. } Here we will get Ok click action.

Sometimes it is required to implement Enum on your own. E.g. there is no clear way to extend other enums. Custom implementation allows this: class Enum { constructor(protected value: string) {} public toString() { return String(this.value); } public is(value: Enum | string) { ...

enum SourceEnum { value1 = <any>'value1', value2 = <any>'value2' } enum AdditionToSourceEnum { value3 = <any>'value3', value4 = <any>'value4' } // we need this type for TypeScript to resolve the types correctly type TestEnumType = SourceEnum | AdditionToS...

Simple form, validation and submission functions to create a "mailing list" feature. This can then be applied to either the basic page or basic block examples. Assumes you have created a table in the drupal database called 'mailing_list' with the fields first name, last name and email ad...

Simple form, validation and submission functions to create a "mailing list" feature. This can then be applied to either the basic page or basic block examples. Assumes you have created a table in the drupal database called 'mailing_list' with the fields first name, last name and email ad...

Requirements: NodeJS : Download page npm or yarn Run the following commands with cmd from new directory folder: npm install -g @angular/cli or yarn global add @angular/cli ng new PROJECT_NAME cd PROJECT_NAME ng serve Open your browser at localhost:4200

Detailed instructions on getting simulink set up or installed.

Given the CSV file peoples.csv: 1,Reed,United States,Female 2,Bradley,United States,Female 3,Adams,United States,Male 4,Lane,United States,Male 5,Marshall,United States,Female 6,Garza,United States,Male 7,Gutierrez,United States,Male 8,Fox,Germany,Female 9,Medina,United States,Male 10,Nich...

Pre-requisites: Java 7 Hadoop (Refer here for Hadoop Installation) Mysql Server and Client Installation: Step 1: Download the latest Hive tarball from the downloads page. Step 2: Extract the downloaded tarball (Assumption: The tarball is downloaded in $HOME) tar -xvf /home/username/apache...

Homebrew can be installed using the following command in the terminal: /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" It runs as the current user; you don’t need to use sudo. The script can be viewed online and will print a summary of...

app.component.html <div> <div> <div *ngFor="let user of users"> <button class="btn" [@buttonState]="user.active" (click)="user.changeButtonState()">{{user.firstName}}</button> <...

If you need to extract information from a text response, the easiest way is to use Regular Expressions. The matching pattern is very similar to the one used in Perl. Let’s assume we want to test a flight ticket purchase workflow. The first step is to submit the purchase operation. The next step is t...

XPath can be used to navigate through elements and attributes in an XML document. It could be useful when data from the response cannot be extracted using the Regular Expression Extractor. For example, in the case of a scenario where you need to extract data from similar tags with the same attribute...

The CSS/JQuery extractor enables extracting values from a server response by using a CSS/JQuery selector syntax, which might have otherwise been difficult to write using Regular Expression. As a post-processor, this element should be executed to extract the requested nodes, text or attribute values...

JSON is a commonly used data format that is used in web based applications. The JMeter JSON Extractor provides a way to use JSON Path expressions for extracting values from JSON-based responses in JMeter. This post processor must be placed as a child of the HTTP Sampler or for any other sampler that...

When you manually write your performance scripts, you need to deal with correlation yourself. But there is another option to create your scripts - automation scripts recording. On the one hand, the manual approach helps your write structured scripts and you can add all the required extractors at the...