Tutorial by Examples: basic

A basic but illustrative heatmap showing correlations between a number of variables. import pandas as pd import seaborn as sns import numpy as np # Sample dataframe with date index and five variables np.random.seed(123) df = pd.DataFrame(np.random.uniform(-0.25,0.25,size=(5, 5)), ...

STUFF(Original_Expression, Start, Length, Replacement_expression) STUFF() function inserts Replacement_expression, at the start position specified, along with removing the characters specified using Length parameter. Select FirstName, LastName,Email, STUFF(Email, 2, 3, '*****') as StuffedEmail Fr...

1.The Unit return type declaration is optional for functions. The following codes are equivalent. fun printHello(name: String?): Unit { if (name != null) println("Hello ${name}") } fun printHello(name: String?) { ... } 2.Single-Ex...

app.module.ts import {appStoreProviders} from "./app.store"; providers : [ ... appStoreProviders, ... ] app.store.ts import {InjectionToken} from '@angular/core'; import {createStore, Store, compose, StoreEnhancer} from 'redux'; import {AppState, default as reduce...

MCVE's should start the Shiny app when they are copied in the console. An easy way to do this is using the shinyApp function. For example: why is my checkbox not responding? library(shiny) ui <- fluidPage( checkboxInput('checkbox', 'click me'), verbatimTextOutput('text') ) serv...

The most basic implementation of a union-find data structure consists of an array parent storing the a parent element for every element of the structure. Following these parent 'pointers' for an element i leads us to the representative j = find(i) of the set containing i, where parent[j] = j holds....

Consider the following HTML markup: <section> <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.</p> <p>...

In landscape orientation \documentclass[final,t]{beamer} \mode<presentation> { \usetheme{Berlin} } \usepackage[orientation=landscape,size=a1,scale=1,debug]{beamerposter} \usepackage{lipsum} % for dummy text \title[]{\huge Awesome title} \author[]{\large \textbf{Author Name...

Navigation bars are essentially a list of links, so the ul and li elements are used to encase navigation links. <ul> <li><a href="#">Home</a></li> <li><a href="#">About</a></li> <li><a href="#">...

This code example creates a UDP client then sends "Hello World" across the network to the intended recipient. A listener does not have to be active, as UDP Is connectionless and will broadcast the message regardless. Once the message is sent, the clients work is done. byte[] data = Enco...

if object_id('tempdb.dbo.#temp') is not null drop table #temp create table #temp ( dateValue datetime, category varchar(3), amount decimal(36,2) ) insert into #temp values ('1/1/2012', 'ABC', 1000.00) insert into #temp values ('2/1/2012', 'DEF', 500.00) insert into #temp value...

Using DOSKEY, we can create macros to simplify typing many commands in command prompt. Take a look at the following example. DOSKEY macro=echo Hello World Now if you type macro in the command prompt, it would return Hello World.

// Import the action types to recognize them import { ACTION_ERROR, ACTION_ENTITIES_LOADED, ACTION_ENTITY_CREATED } from './actions'; // Set up a default state const initialState = { error: undefined, entities: [], loading: true }; // If no state is provided, we take the defa...

Data annotations are a way of adding more contextual information to classes or members of a class. There are three main categories of annotations: Validation Attributes: add validation criteria to data Display Attributes: specify how the data should be displayed to the user Modelling Attributes...

Once you have node.js installed on your system, you can just follow the procedure below to get a basic web server running with support for both HTTP and HTTPS! Step 1 : Build a Certificate Authority create the folder where you want to store your key & certificate : mkdir conf ...

<?php //Creating Connection to MySQL database using MySQLi $mysqli = mysqli_connect("IP ADDRESS OR DOAMIN", "username", "password", "database_name"); //Executing Query in the Database using MySQLi $result = mysqli_query($mysqli, "SELECT * FROM T...

Locators by themselves do not return an element which can be interacted with in Protractor, they are simply instructions that indicate Protractor how to find the element. To access the element itself, use this syntax: element(locator); element.all(locator); Note: the element(s) is not actually...

{ "title": "Person", "type": "object", "properties": { "firstName": { "type": "string" }, "lastName": { "type": "string" ...

The MyFrame class the extends JFrame and also contains the main method import javax.swing.JFrame; public class MyFrame extends JFrame{ //main method called on startup public static void main(String[] args) throws InterruptedException { //creates a frame window ...

// array var arr = [ 'one', 'two', 'three', 'four' ]; $.each(arr, function (index, value) { console.log(value); // Will stop running after "three" return (value !== 'three'); }); // Outputs: one two three