Tutorial by Examples: n

InvocationExpression Class

InvocationExpression class allows invocation of other lambda expressions that are parts of the same Expression tree. You create them with static Expression.Invoke method. Problem We want to get on the items which have "car" in their description. We need to check it for null before searc...

.NET Framework • Expression Trees

The Basics (Tables and Inline CSS)

Tables for Layout The structure of an HTML email file is similar to that of a web page: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello!</title> </head> <body> &...

email • Getting started with email

Content-Type

The Content-Type meta tag is for telling the destination rendering engine how to process text and special characters. You should encode all special characters anyway (e.g., & becomes &amp; for an ampersand) to be safe, but it’s worth keeping this line in there anyway. utf-8 works for most c...

email • Meta Information

Disable auto-scale in iOS 10 Mail

Apple iOS 10 Mail doesn't always auto-scale non-responsive emails. The auto-scale meta tag can be used to disable auto-scale feature in iOS 10 Mail entirely. <meta name="x-apple-disable-message-reformatting">

email • Meta Information

Using a TestScheduler to advance time manually

Most Rx operators take an optional scheduler on which to schedule their future iterations. If not supplied they will use their default configured scheduler. Supplying a scheduler can be useful for testing purposes in which we like to talk about virtual time instead of real time for speed of test exe...

rxjs • Scheduler

Self Referencing Employee Table

ms-access • Self-Referencing tables

Tuples within Collections

Tuples are often used within collections but they must be handled in a specific way. For example, given the following list of tuples: scala> val l = List(1 -> 2, 2 -> 3, 3 -> 4) l: List[(Int, Int)] = List((1,2), (2,3), (3,4)) It may seem natural to add the elements together using im...

Scala Language • Tuples

Escaping Characters

YAML supports three styles of escape notation: Entity Escapes a. space: "&#x20;" b. colon: "&#58;" c. ampersand: "&amp;" Unicode Escapes a. space: "\u0020" b. single quote: "\u0027" c. double quote: "\u0022" ...

yaml • Getting started with yaml

TRUNCATE clause

Use this to reset the table to the condition at which it was created. This deletes all rows and resets values such as auto-increment. It also doesn't log each individual row deletion. TRUNCATE TABLE Employees

SQL • DELETE

Getting Started with Phaser using Node.js

Create a folder where you would like to have your game live, and move into that mkdir my-new-game cd my-new-game Initialize the directory using npm. npm init -y Install phaser as a node package. npm install phaser Install http-server as a global module, to be used on the...

phaser-framework • Getting started with phaser-framework

Interval Scheduling

We have a set of jobs J={a,b,c,d,e,f,g}. Let j in J be a job than its start at sj and ends at fj. Two jobs are compatible if they don't overlap. A picture as example: The goal is to find the maximum subset of mutually compatible jobs. There are several greedy approaches for this problem: Earli...

algorithm • Applications of Greedy technique

Read subset of a global raster defined by a bounding box

Open a raster that covers the globe and extract a subset of the raster. import gdal # Path to a tiff file covering the globe # http://visibleearth.nasa.gov/view.php?id=57752 tif_name = "/path_name/land_shallow_topo_21600.tif" # Open raster in read only mode ds = gdal.Open(tif_n...

gdal • Reading rasters with gdal

Recursive Solution

Matrix chain multiplication is an optimization problem that can be solved using dynamic programming. Given a sequence of matrices, the goal is to find the most efficient way to multiply these matrices. The problem is not actually to perform the multiplications, but merely to decide the sequence of t...

dynamic-programming • Matrix Chain Multiplication

Flash message on response using http interceptor

In the view file In the base html (index.html) where we usually include the angular scripts or the html that is shared across the app, leave an empty div element, the flash messages will be appearing inside this div element <div class="flashmessage" ng-if="isVisible"> ...

AngularJS • HTTP Interceptor

Create a quartz scheduler to display some information

In order to create a scheduler,the entry needs to be created in liferay-portlet.xml provding scheduler class and trigger value for timing of scheduler triggering <portlet-name>GetSetGo</portlet-name> <icon>/icon.png</icon> <scheduler-entry> ...

liferay • Create a Quartz scheduler in liferay

Minimizing Lateness

There are numerous problems minimizing lateness, here we have a single resource which can only process one job at a time. Job j requires tj units of processing time and is due at time dj. if j starts at time sj it will finish at time fj=sj+tj. We define lateness L=max{0,fj-dh} for all j. The goal is...

algorithm • Applications of Greedy technique

Install PostgreSQL from Source on Linux

Dependencies: GNU Make Version > 3.80 an ISO/ ANSI C-Compiler (e.g. gcc) an extractor like tar or gzip zlib-devel readline-devel oder libedit-devel Sources: Link to the latest source (9.6.3) Now you can extract the source files: tar -xzvf postgresql-9.6.3.tar.gz There are a large ...

postgresql • Getting started with postgresql

PL/pgSQL Syntax

CREATE [OR REPLACE] FUNCTION functionName (someParameter 'parameterType') RETURNS 'DATATYPE' AS $_block_name_$ DECLARE --declare something BEGIN --do something --return something END; $_block_name_$ LANGUAGE plpgsql;

postgresql • Programming with PL/pgSQL

RETURNS Block

Options for returning in a PL/pgSQL function: Datatype List of all datatypes Table(column_name column_type, ...) Setof 'Datatype' or 'table_column'

postgresql • Programming with PL/pgSQL

iOS Build Automation Setup using Shenzhen

Part I : Setup the Mac machine to use shenzhen Go to terminal Install Shenzhen sudo gem install shenzhen sudo gem install nomad-cli Download XCode command line utility xcode-select --install Popup shows up with the below text The xcode-select command requires the command line d...

jenkins • Setting up Build Automation for iOS using Shenzhen