Book Image

Modern R Programming Cookbook

By : Jaynal Abedin
Book Image

Modern R Programming Cookbook

By: Jaynal Abedin

Overview of this book

R is a powerful tool for statistics, graphics, and statistical programming. It is used by tens of thousands of people daily to perform serious statistical analyses. It is a free, open source system whose implementation is the collective accomplishment of many intelligent, hard-working people. There are more than 2,000 available add-ons, and R is a serious rival to all commercial statistical packages. The objective of this book is to show how to work with different programming aspects of R. The emerging R developers and data science could have very good programming knowledge but might have limited understanding about R syntax and semantics. Our book will be a platform develop practical solution out of real world problem in scalable fashion and with very good understanding. You will work with various versions of R libraries that are essential for scalable data science solutions. You will learn to work with Input / Output issues when working with relatively larger dataset. At the end of this book readers will also learn how to work with databases from within R and also what and how meta programming helps in developing applications.
Table of Contents (10 chapters)

Creating a function to return an object of the S4 class

In R, whenever you write a function, by default the return object gets an S3 class but if you want to return an object that has S4 class, then you should explicitly define the class within the body of the function. In the previous recipes, you saw that the class has been defined outside of the function body. In this recipe, you will write a function that will return an object of the S4 class.

Getting ready

Your objective is to create a function that will calculate the following two types of descriptive statistics:

  • Classical (mean and standard deviation)
  • Robust (median and MAD)

The following is the vector of numeric values for the input. Your new function will take two...