Tutorial by Examples: cs

A basic SinglyLinkedList example in Java

A basic implementation for singly-linked-list in java - that can add integer values to the end of the list, remove the first value encountered value from list, return an array of values at a given instant and determine whether a given value is present in the list. Node.java package com.example.so....

data-structures • Linked List

Get execution statistics for SQL queries/plans

The following query will return informationa about qeries, their plans and average statistics regarding their duration, CPU time, physical and logical io reads. SELECT Txt.query_text_id, Txt.query_sql_text, Pl.plan_id, avg_duration, avg_cpu_time, avg_physical_io_reads, avg_logica...

Microsoft SQL Server • Query Store

Import multiple csv files

files = list.files(pattern="*.csv") data_list = lapply(files, read.table, header = TRUE) This read every file and adds it to a list. Afterwards, if all data.frame have the same structure they can be combined into one big data.frame: df <- do.call(rbind, data_list)

R Language • Reading and writing tabular data in plain-text files (CSV, TSV, etc.)

Displaying Google Analytics data in your Website

This document explains how to get Google Access tokens and use them to get Google Analytics data to be displayed in our websites. Example: A live example is available in https://newtonjoshua.com note: Use the same gmail account for all the below steps. STEP 1: Set Up Google Analytics Foll...

google-analytics • Displaying Google Analytics data in your Website

STRING example for C strings

*> Strip off trailing zero bytes STRING c-string DELIMITED BY LOW-VALUE INTO working-store

cobol • STRING statement

Client side csv download using Blob

function downloadCsv() { var blob = new Blob([csvString]); if (window.navigator.msSaveOrOpenBlob){ window.navigator.msSaveBlob(blob, "filename.csv"); } else { var a = window.document.createElement("a"); a.href = window.URL.createObjectURL(blob, { ...

JavaScript • File API, Blobs and FileReaders

create css/js specific to a platform (android/ios)

Let say you want to create css/js file specific to a platform. For that you have to create a merges folder in root folder of you cordova porject. In merges folder create directory for each platform (android/ios..). then in specific platform folder create a css/js folder and put your css/js file spec...

Cordova • How to customize platform specific www folder in cordova

Pan, zoom, and rotate with QGraphicsView

QGraphics can be used to organize complicated scenes of visual objects into a framework that makes them easier to handle. There are three major types of objects used in this framework QGraphicsView, QGraphicsScene, and QGraphicsItems. QGraphicsItems are the basic visual items that exist in the scen...

Qt • QGraphics

2. String Manipulation Basics

'Base string Dim exStr : exStr = " <Head>data</Head> " 'Left Dim res: res = Left(exStr,6) 'res now equals " <Head" 'Right Dim res: res = Right(exStr,6) 'res now equals "Head> " 'Mid Dim res: res = Mid(exStr,8,4) 'res now equals "data&quot...

vbscript • Strings

Basic scan usage

scan is used for calling function multiple times over a list of values, the function may contain state. scan syntax (as of theano 0.9): scan( fn, sequences=None, outputs_info=None, non_sequences=None, n_steps=None, truncate_gradient=-1, go_backwards=False, m...

theano • Loops with theano

1. Basics

Service broker is technology based on asyncronous communication between two(or more) entities. Service broker consists of: message types, contracts, queues, services, routes, and at least instance endpoints More: https://msdn.microsoft.com/en-us/library/bb522893.aspx

Microsoft SQL Server • Service broker

3. Create basic service broker construction on database (single database communication)

USE [MyDatabase] CREATE MESSAGE TYPE [//initiator] VALIDATION = WELL_FORMED_XML; GO CREATE CONTRACT [//call/contract] ( [//initiator] SENT BY INITIATOR ) GO CREATE QUEUE InitiatorQueue; GO CREATE QUEUE TargetQueue; GO CREATE SERVICE InitiatorService ON QUEUE...

Microsoft SQL Server • Service broker

Dependency injection basics

Almost any controller needs some external dependencies to work. Here is a way to configure a dependency object (or its factory) and pass it to a controller. Doing so will help to sustain a separation of concerns, keep code clear and testable. Say, we have an interface and its implementation that...

asp.net-core-mvc • Getting started with asp.net-core-mvc

Sass and Css - Preprocessing with Gulp

Before starting gulp we need to install node.js and npm. Then install gulp-sacc $ npm i gulp-sass --save-dev // i = install Gulp Head var gulp = require('gulp'); // Requires the gulp-sass plugin var sass = require('gulp-sass'); Gulp Body gulp.task('sass', function(){ return gulp.src('...

gulp • Minifying CSS

Creating Images, JS, and CSS(SASS) rule for ordering files

Installing Gulp and His Tasks $ npm install gulp --save-dev $ npm install gulp-sass --save-dev $ npm install gulp-uglify --save-dev $ npm install gulp-imagemin --save-dev Determining Folder Structure In this structure, we will use the app folder for development purposes, while the dist folde...

gulp • Using file filters.

Split (reshape) CSV strings in columns into multiple rows, having one element per row

import pandas as pd df = pd.DataFrame([{'var1': 'a,b,c', 'var2': 1, 'var3': 'XX'}, {'var1': 'd,e,f,x,y', 'var2': 2, 'var3': 'ZZ'}]) print(df) reshaped = \ (df.set_index(df.columns.drop('var1',1).tolist()) .var1.str.split(',', expand=True) .stack() .reset_ind...

pandas • Reshaping and pivoting

Basic state with AASM

Usually you'll end up creating models which will contain a state, and that state will be changing during the lifespan of the object. AASM is a finite state machine enabler library that can help you out with dealing with having an easy passing through the process design of your objects. Having some...

Ruby on Rails • Model states: AASM

Adding a background-image rule via the CSSOM

To add a background-image rule via the CSSOM, first get a reference to the rules of the first stylesheet: var stylesheet = document.styleSheets[0].cssRules; Then, get a reference to the end of the stylesheet: var end = stylesheet.length - 1; Finally, insert a background-image rule for the bo...

CSS • CSS Object Model (CSSOM)

Basic static files and favicon serve example

var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var app = express(); app.use(favicon(__dirname + '/public/img/favicon.ico')); app.use(express.static(path.join(__dirname, 'public'))); app.listen(3000, function() { console.log("...

express • Handling static files

Ninja Twist (Turtle Graphics)

Here a Turtle Graphics Ninja Twist: import turtle ninja = turtle.Turtle() ninja.speed(10) for i in range(180): ninja.forward(100) ninja.right(30) ninja.forward(20) ninja.left(60) ninja.forward(50) ninja.right(30) ninja.penup() ninja.setposit...

Python Language • Turtle Graphics