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Modern R Programming Cookbook
Modern R Programming Cookbook

Modern R Programming Cookbook: Recipes to simplify your statistical applications

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Profile Icon Jaynal Abedin
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€36.99
Paperback Oct 2017 236 pages 1st Edition
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€20.98 €29.99
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Arrow left icon
Profile Icon Jaynal Abedin
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€36.99
Paperback Oct 2017 236 pages 1st Edition
eBook
€20.98 €29.99
Paperback
€36.99
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Renews at €18.99p/m
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Modern R Programming Cookbook

Data Structures in R

In this chapter, you will learn about the data structures of R and how to create and access its properties, and various operations related to a specific data structure. The following recipes will be covered in this chapter:

  • Creating a vector and accessing its properties
  • Creating a matrix and accessing its properties
  • Creating a data frame and accessing its properties
  • Creating an array and accessing its properties
  • Creating a list from a combination of vector, matrix, and data frames
  • Converting a matrix to a data frame and a data frame to a matrix

Introduction

To use R most efficiently and effectively, you must understand the data types and data structures of R, because the Machine Learning algorithms such as Support Vector Machine (SVM), decision tree, and even linear regression and logistic regression have optimization components. The use of the correct data types is the key part of the performance of optimization. Also, to perform matrix operations, the user must use matrix data types. Moreover, the user needs to know the use of correct variables into the statistical model, and understanding R data types is the important aspect in this area. Here are the data types that will help you store and manage your data correctly and efficiently:

  • Character
  • Numeric
  • Logical
  • Integer
  • Complex

The data structure of R is the way to organize the dataset for data storage and analytics purposes. Each of the different data structures can...

Creating a vector and accessing its properties

In this recipe, you will learn what a vector is in R, and how to create it, access its properties, and perform certain operations.

Getting ready

To follow this recipe, you need the R software installed on your computer. Before going to the next step, you have to understand the definition of a vector in R. In R, a vector is simply a collection of values with the same type; it could be all character, numeric, or logical. For example, it could contain names of places/countries, it could contain the number of hours a person spends on the internet over the last seven days, or it could also contain whether a group of people has a certain disease or not (true/false).

...

Creating a matrix and accessing its properties

A matrix is a two-dimensional arrangement of vectors of the same type. Like vectors in R, the matrix is restricted to one data type. In this recipe, you will learn how to create a matrix, how to access its elements, and understand a few notes on matrix operations.

Getting ready

To get started with this recipe, you must have R installed on your computer. You also need to understand the structure of a matrix and various operations. There is no library required for this recipe, but if you are interested in advanced matrix algebra, then you might consider the See also section of this recipe. A matrix is considered as a two-dimensional grid where each cell is represented by a row and...

Creating a data frame and accessing its properties

A data frame in R is also a two-dimensional arrangement like a matrix, but it can contain a combination of data types in different columns. One column could be numeric, another column could be character. A data frame can be considered as a natural generalization of a matrix in R. In this recipe, you will learn how to create a data frame and how to access various columns and/or elements of it.

Getting ready

Since you have already learned to create a matrix, it will be relatively simple to understand the data frame. It is good to have an understanding of variables and datasets. Though the structure of a data frame is similar to a matrix, it has more information within it.

...

Creating an array and accessing its properties

An array is a way to organize data of the same type in more than two dimensions. An array could be of any dimension, and the data type must be the same in each of the array elements. A matrix is a special case of an array with only two dimensions. In this recipe, you will learn how to create an array and how to access its elements.

Getting ready

Suppose you are in a situation where you must store a series of matrices into a single R object and then perform analysis based on that; however, in this case, this is the perfect and efficient way to create an array. For example, you are in a situation to store four matrices of 2 x 2 order.

...

Creating a list from a combination of vector, matrix, and data frame

A list is the natural generalization of a data frame in R. A data frame is a rectangular arrangement of rows and columns where each of the columns must be of the same length. A list can contain a variety of heterogeneous objects with various lengths and data types. An array contains only one data type, whereas a list could contain heterogeneous data types of various lengths. In that sense, a list is also a natural generalization of an array. A list is a versatile R object, and it is important to know how it stores elements and how you can access it. In this recipe, you will learn how to create a list and access its elements.

Getting ready

Recall that you...

Converting a matrix to a data frame and a data frame to a matrix

A matrix is a two-dimensional arrangement of data with rows and columns where each row/column is of the same data type, either all numeric, all character, or all logical. Moreover, the number of elements in each column should be the same, and the number of elements in each row should also be the same.

A data frame is also a two-dimensional arrangement of data with rows and columns, but each column could be of very different types; for example, a data frame may contain both character and numeric columns. However, the number of elements in each column should be the same. Since both data structures share some common properties, they could be converted from one structure to another. In this recipe, you will learn to convert a matrix to a data frame and a data frame to a matrix.

...
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Key benefits

  • Develop strategies to speed up your R code
  • Tackle programming problems and explore both functional and object-oriented programming techniques
  • Learn how to address the core problems of programming in R with the most popular R packages for common tasks

Description

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.

Who is this book for?

This book is for developers who would like to enhance the R programming skills. Basic knowledge of R programming is assumed.

What you will learn

  • • Install R and its various IDE for a given platform along with installing libraries from different repositories and version control
  • • Learn about basic data structures in R and how to work with them
  • • Write customized R functions and handle recursions, exceptions in R environments
  • • Create the data processing task as a step by step computer program and execute using dplyr
  • • Extract and process unstructured text data
  • • Interact with database management system to develop statistical applications
  • • Formulate and implement parallel processing in R
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Table of Contents

9 Chapters
Installing and Configuring R and its Libraries Chevron down icon Chevron up icon
Data Structures in R Chevron down icon Chevron up icon
Writing Customized Functions Chevron down icon Chevron up icon
Conditional and Iterative Operations Chevron down icon Chevron up icon
R Objects and Classes Chevron down icon Chevron up icon
Querying, Filtering, and Summarizing Chevron down icon Chevron up icon
R for Text Processing Chevron down icon Chevron up icon
R and Databases Chevron down icon Chevron up icon
Parallel Processing in R Chevron down icon Chevron up icon
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