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

Creating scatter plots with Incanter


One of the most common types of charts is a scatter plot. This helps us visualize the relationship between two numeric variables.

Getting ready

We'll need to list Incanter as a dependency in our Leiningen project.clj file.

:dependencies [[org.clojure/clojure "1.4.0"]
               [incanter "1.4.1"]]

We'll also need to enter several of Incanter's namespaces into our script or REPL.

(require '[incanter.core :as i]
         '[incanter.charts :as c]
         'incanter.datasets)

Finally, we'll use the Iris dataset, which we saw in several recipes in Chapter 9, Clustering, Classifying, and Working with Weka.

(def iris (incanter.datasets/get-dataset :iris))

How to do it…

For this recipe, we'll do a chart graphing the dimensions of the Iris' petals.

  1. We'll create the chart, but hang on to the object created so we can do things with the chart later, like display it.

    (def iris-petal-scatter
      (c/scatter-plot (i/sel iris :cols :Petal.Width)
                      (i/sel iris ...