Book Image

Clojure Data Analysis Cookbook

By : Eric Rochester
Book Image

Clojure Data Analysis Cookbook

By: Eric Rochester

Overview of this book

<p>Data is everywhere and it's increasingly important to be able to gain insights that we can act on. Using Clojure for data analysis and collection, this book will show you how to gain fresh insights and perspectives from your data with an essential collection of practical, structured recipes.<br /><br />"The Clojure Data Analysis Cookbook" presents recipes for every stage of the data analysis process. Whether scraping data off a web page, performing data mining, or creating graphs for the web, this book has something for the task at hand.<br /><br />You'll learn how to acquire data, clean it up, and transform it into useful graphs which can then be analyzed and published to the Internet. Coverage includes advanced topics like processing data concurrently, applying powerful statistical techniques like Bayesian modelling, and even data mining algorithms such as K-means clustering, neural networks, and association rules.</p>
Table of Contents (18 chapters)
Clojure Data Analysis Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Visualizing graphs with force-directed layouts


One popular way of visualizing graphs of data is to use a force-directed layout. This employs a physical simulation of charged particles and springs to create an aesthetically pleasing visualization. It minimizes crossed lines, while keeping all edges more or less the same length. This makes the relationships in the graph immediately clear, at the expense of expressing the distances between nodes. For example, consider the following diagram. On the left, we have a graph randomly laid out. On the right, it's laid out using a force-directed layout. Each of the edges is approximately as long as the others, and each node is as far away from its neighbors as it can get.

In this recipe, we'll create a force-directed graph visualization for a K-means cluster of the US Census Race Data, aggregated by state.

Getting ready

We'll use the same dependencies and plugins in our project.clj file as we did in the Creating scatter plots with NVD3 recipe.

As I just...