Book Image

R Web Scraping Quick Start Guide

By : Olgun Aydin
Book Image

R Web Scraping Quick Start Guide

By: Olgun Aydin

Overview of this book

Web scraping is a technique to extract data from websites. It simulates the behavior of a website user to turn the website itself into a web service to retrieve or introduce new data. This book gives you all you need to get started with scraping web pages using R programming. You will learn about the rules of RegEx and Xpath, key components for scraping website data. We will show you web scraping techniques, methodologies, and frameworks. With this book's guidance, you will become comfortable with the tools to write and test RegEx and XPath rules. We will focus on examples of dynamic websites for scraping data and how to implement the techniques learned. You will learn how to collect URLs and then create XPath rules for your first web scraping script using rvest library. From the data you collect, you will be able to calculate the statistics and create R plots to visualize them. Finally, you will discover how to use Selenium drivers with R for more sophisticated scraping. You will create AWS instances and use R to connect a PostgreSQL database hosted on AWS. By the end of the book, you will be sufficiently confident to create end-to-end web scraping systems using R.
Table of Contents (7 chapters)

Storing Data and Creating Cronjob

Cloud computing is a system of information technology that enables access to the configurable system resources at any time and can be accessed from anywhere, which can be quickly accessed with minimal administrative overhead on the internet. The cloud computing logic is based on the principle of sharing resources.

Instead of spending resources on computer infrastructure and the maintenance of institutions, cloud systems enable these resources to be broken down into basic businesses. Since the introduction of Amazon EC2 in 2006, the availability of high-capacity and high-speed networks, low-cost computers, and storage systems has been widespread. Hardware virtualization has also begun to be widely used.

In the 1960s, the first concepts of time sharing became popular with the launching of the Remote Job Entry (RJE). This terminology is often used...