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Modern R Programming Cookbook

You're reading from   Modern R Programming Cookbook Recipes to simplify your statistical applications

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781787129054
Length 236 pages
Edition 1st Edition
Languages
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Author (1):
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Jaynal Abedin Jaynal Abedin
Author Profile Icon Jaynal Abedin
Jaynal Abedin
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Toc

Table of Contents (10) Chapters Close

Preface 1. Installing and Configuring R and its Libraries FREE CHAPTER 2. Data Structures in R 3. Writing Customized Functions 4. Conditional and Iterative Operations 5. R Objects and Classes 6. Querying, Filtering, and Summarizing 7. R for Text Processing 8. R and Databases 9. Parallel Processing in R

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...
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