Tutorial by Examples: e

Read, Write and Insert into Internal Tables

Read, write and insert into internal tables with a header line: " Read from table with header (using a loop): LOOP AT i_compc_all. " Loop over table i_compc_all and assign header line CASE i_compc_all-ftype. " Read cell ftype from header line from table i_com...

ABAP • Internal Tables

Avoiding Divide by Zero with NumberSet Operations

In order to avoid a divide by zero with a numberSet (what you get after a reduction like avg()) you can short-circuit the logic: $five = min(q("sum:rate{counter,,1}:haproxy.frontend.hrsp{}{status_code=5xx}", "1h", "")) $two = avg(q("sum:rate{counter,,1}:haproxy.f...

Bosun • Expression Tips and Tricks

Avoiding Divide by Zero in SeriesSet Operations

With series operations, things are dropped from the left side if there is no corresponding timestamp/datapoint in the right side. You can mix this with the dropbool function to avoid divide by zero: $five = q("sum:rate{counter,,1}:haproxy.frontend.hrsp{}{status_code=5xx}", "1h",...

Bosun • Expression Tips and Tricks

Capture canvas and Save as webM video

Creating a WebM video from canvas frames and playing in canvas, or upload, or downloading. Example capture and play canvas name = "CanvasCapture"; // Placed into the Mux and Write Application Name fields of the WebM header quality = 0.7; // good quality 1 Best < 0.7 ok to poor fps =...

html5-canvas • Media types and the canvas

Simple ServiceLoader Example

The ServiceLoader is a simple and easy to use built-in mechanism for dynamic loading of interface implementations. With the service loader - providing means for instantation (but not the wiring) - a simple dependency injection mechanism can be built in Java SE. With the ServiceLoader interface and ...

Java Language • ServiceLoader

Installation or Setup

As shown in the step by step guide (getting started with Amazon Redshift),it involves : Step 1: Set Up Prerequisites Step 2: Launch a Sample Amazon Redshift Cluster Step 3: Authorize Access to the Cluster Step 4: Connect to the Sample Cluster Setting Up Prerequisites Sett...

amazon-redshift • Getting started with amazon-redshift

Installation or Setup

There are following setups to install opencart on your webserver Download the latest version of opencart for the official website or github and extract the files. In extracted files you can see the upload folder, license.txt file and readme.txt file The upload folder contains all the files to...

opencart2.x • Getting started with opencart2.x

Alternate installation (not conda)

Alternate ways to install SymPy from conda. conda is the recommended way, but these are some alternate ways. Including: git, pip, etc.

sympy • Getting started with sympy

Installation or Setup

NSIS installer can be downloaded from http://nsis.sourceforge.net/Download. An exe of 1.6 MB will be downloaded. You can install it using the wizard. While installing there are options to install 1. Full: Installs all the components 2. Lite: Basic and only essential components from the UI 3. Mi...

nsis • Getting started with nsis

Pie Chart with Demo

<!doctype html> <html> <head> <style> body{ background-color:white; } #canvas{border:1px solid red; } </style> <script> window.onload=(function(){ var canvas = document.getElementById("canvas"); var ctx = canvas.getContext(&...

html5-canvas • Charts & Diagrams

Array insert function

This function will insert an element into an array at a given index: insert(){ h=' ################## insert ######################## # Usage: # insert arr_name index element # # Parameters: # arr_name : Name of the array variable # index : Index to insert at #...

Bash • Arrays

A function that accepts named parameters

foo() { while [[ "$#" -gt 0 ]] do case $1 in -f|--follow) local FOLLOW="following" ;; -t|--tail) local TAIL="tail=$2" ;; esac shift done echo "FOLLOW: $FOLLOW" echo "TAIL: $...

Bash • Functions

Rotate an Image or Path around it's centerpoint

Steps#1-5 below allow any image or path-shape to be both moved anywhere on the canvas and rotated to any angle without changing any of the image/path-shape's original point coordinates. Move the canvas [0,0] origin to the shape's center point context.translate( shapeCenterX, shapeCenterY ); ...

html5-canvas • Transformations

Compare Attribute

The Compare attribute compares two properties of a model. The error message can be specified using property ErrorMessage, or using resource files. To use Compare attribute include using for the following namespace: using System.ComponentModel.DataAnnotations; Then you can use the attribute in ...

asp.net-mvc • Data annotations

Mouse coordinates after resizing (or scrolling)

Canvas apps often rely heavily on user interaction with the mouse, but when the window is resized, the mouse event coordinates that canvas relies on are likely changed because resizing causes the canvas to be offset in a different position relative to the window. Thus, responsive design requires tha...

html5-canvas • Responsive Design

Finding information about a running process

ps aux | grep <search-term> shows processes matching search-term Example: root@server7:~# ps aux | grep nginx root 315 0.0 0.3 144392 1020 ? Ss May28 0:00 nginx: master process /usr/sbin/nginx www-data 5647 0.0 1.1 145124 3048 ? S Jul18 2:53 nginx: worke...

Bash • Jobs and Processes

basic channel operations: creating, putting, taking, closing, and buffers.

core.async is about making processes that take values from and put values into channels. (require [clojure.core.async :as a]) Creating channels with chan You create a channel using the chan function: (def chan-0 (a/chan)) ;; unbuffered channel: acts as a rendez-vous point. (def chan-1 (a/chan...

clojure • core.async

Constructor Injection

/** * @var \Vendor\Module\Helper\Data */ protected $customHelper; /** * Constructor call * @param \Vendor\Module\Helper\Data $customHelper */ public function __construct( \Vendor\Module\Helper\Data $customHelper ) { $this->customHelper = $customHelper; parent::__co...

magento2 • Dependency Injection

Introduction to Symmetric and Asymmetric Encryption

You can improve the security for data transit or storing by implementing encrypting techniques. Basically there are two approaches when using System.Security.Cryptography: symmetric and asymmetric. Symmetric Encryption This method uses a private key in order to perform the data transformation. ...

C# Language • Cryptography (System.Security.Cryptography)

Using Interfaces to Enforce Types

One of the core benefits of Typescript is that it enforces data types of values that you are passing around your code to help prevent mistakes. Let's say you're making a pet dating application. You have this simple function that checks if two pets are compatible with each other... checkCompatible...

TypeScript • Interfaces