Exploring Everyday Things With R and Ruby

, by Chang, Sau Sheong

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ISBN: 9781449315153 | 1449315151
Cover: Paperback
Copyright: 7/30/2012

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Programming is not just for geeks. If you're curious about how things work, and want to get programmatic solutions to everyday problems, this intriguing book will help you find what you're looking for. By using some fundamental math and simple Ruby and R constructs, you'll learn how to model the problem and work toward a solution. Discover reasons why things are the way they are by spelunking data freely available on the Internet. You'll model and simulate environments and systems, and then observe and analyze the results. See the world around you through programming eyes.

Preface	p. vii
The Hat and the Whip	p. 1
Ruby	p. 1
Why Ruby	p. 2
Installing Ruby	p. 3
Running Ruby	p. 4
Requiring External Libraries	p. 5
Basic Ruby	p. 7
Everything Is an Object	p. 13
Shoes	p. 19
What Is Shoes?	p. 19
A Rainbow of Shoes	p. 20
Installing Shoes	p. 20
Programming Shoes	p. 21
Wrap-up	p. 25
Into the Matrix	p. 27
Introducing R	p. 27
Using R	p. 28
The R Console	p. 29
Sourcing Files and the Command Line	p. 31
Packages	p. 33
Programming R	p. 35
Variables and Functions	p. 36
Conditionals and Loops	p. 37
Data Structures	p. 39
Importing Data	p. 46
Charting	p. 51
Basic Graphs	p. 51
Introducing ggplot2	p. 53
Wrap-up	p. 61
Offices and Restrooms	p. 63
The Simple Scenario	p. 64
Representing Restrooms and Such	p. 66
The First Simulation	p. 69
Interpreting the Data	p. 73
The Second Simulation	p. 79
The Third Simulation	p. 83
The Final Simulation	p. 88
Wrap-up	p. 91
How to Bean Armchair Economist	p. 95
The Invisible Hand	p. 96
A Simple Market Economy	p. 96
The Producer	p. 97
The Consumer	p. 99
Some Convenience Methods	p. 100
The Simulation	p. 100
Analyzing the Simulation	p. 103
Resource Allocation by Price	p. 107
The Producer	p. 107
The Consumer	p. 108
Market	p. 109
The Simulation	p. 110
Analyzing the Second Simulation	p. 112
Price Controls	p. 116
Wrap-up	p. 119
Discover Yourself Through Email	p. 121
The Idea	p. 121
Grab and Parse	p. 122
The Emailing Habits of Enron Executives	p. 126
Discover Yourself	p. 130
Number of Messages by Day of the Month	p. 130
MailMiner	p. 134
Number of Messages by Day of Week	p. 137
Number of Messages by Month	p. 138
Number of Messages by Hour of the Day	p. 139
Interactions	p. 142
Comparative Interactions	p. 144
Text Mining	p. 147
Wrap-up	p. 154
In a Heartbeat	p. 157
My Beating Heart	p. 157
Auscultation	p. 158
Homemade Digital Stethoscope	p. 158
Extracting Data from Sound	p. 159
Generating the Heart Sounds Waveform	p. 164
Finding the Heart Rate	p. 166
Oximetry	p. 168
Homemade Pulse Oximeter	p. 168
Extracting Data from Video	p. 169
Generating the Heartbeat Waveform and Calculating the Heart Rate	p. 172
Wrap-up	p. 174
Schooling Fish and Flocking Birds	p. 177
The Origin of Boids	p. 178
Simulation	p. 179
Roids	p. 181
The Boid Flocking Rules	p. 187
Supporting Rules	p. 190
A Variation on the Rules	p. 191
Going Round and Round	p. 193
Putting in Obstacles	p. 194
Wrap-up	p. 195
Money, Sex, and Evolution	p. 197
It's a Good Life	p. 198
Money	p. 198
Sex	p. 211
Birth and Death	p. 211
The Changes	p. 211
Evolution	p. 218
What We Will Be Changing	p. 219
Implementation	p. 220
Wrap-up	p. 224
Index	p. 227
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Exploring Everyday Things With R and Ruby

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