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)

Defining methods for an S4 class

Like S3 classes, generic functions, and methods, there are similar things also available in the S4 object class. In this recipe, you will create a new method for a generic function for an S4 object class.

Getting ready

To define a new method for an S4 class of object, first you need an object of class S4. Here is the code to create an object of S4 class robustSummary2:

    x <- c(13, 21, 19, 18, 21, 16, 21, 24, 17, 18, 12, 18, 29, 17, 18,   
11, 13, 20, 25, 18, 15, 19, 21, 21, 7, 12, 23, 31, 16, 19, 23,
15, 25, 19, 15, 25, 25, 16, 29, 15, 26, 29, 23, 24, 20, 19,
14, 27, 22, 26)
robSum <- function(obj){
med <- median(obj)
mad <- mad(obj)
q1 <- as.numeric...