Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Java Data Analysis
  • Table Of Contents Toc
  • Feedback & Rating feedback
Java Data Analysis

Java Data Analysis

By : John R. Hubbard
close
close
Java Data Analysis

Java Data Analysis

By: John R. Hubbard

Overview of this book

Data analysis is a process of inspecting, cleansing, transforming, and modeling data with the aim of discovering useful information. Java is one of the most popular languages to perform your data analysis tasks. This book will help you learn the tools and techniques in Java to conduct data analysis without any hassle. After getting a quick overview of what data science is and the steps involved in the process, you’ll learn the statistical data analysis techniques and implement them using the popular Java APIs and libraries. Through practical examples, you will also learn the machine learning concepts such as classification and regression. In the process, you’ll familiarize yourself with tools such as Rapidminer and WEKA and see how these Java-based tools can be used effectively for analysis. You will also learn how to analyze text and other types of multimedia. Learn to work with relational, NoSQL, and time-series data. This book will also show you how you can utilize different Java-based libraries to create insightful and easy to understand plots and graphs. By the end of this book, you will have a solid understanding of the various data analysis techniques, and how to implement them using Java.
Table of Contents (14 chapters)
close
close
13
Index

Using random access files


Another alternative for storing the similarity matrix (and the utility matrix) is to use a RandomAccessFile object. This is illustrated in Listing 9.23:

Listing 9.23: Using a random access file

This little test program creates a random access file named inout at line 17. The constant W, defined at line 12, is the number of bytes (8) that Java uses to store a double value. We need that to locate our data in the file. The second argument to the constructor, the string rw, means that we will be both reading from and writing to the file. The loop at lines 18-20 writes 100 square roots into the file. The output from line 21 confirms that the file contains 800 bytes.

The loop at lines 23-27 uses direct access (random access) into the file, just like accessing a 100-element array. Each access requires two steps: seek the location to be read, and then read it. The seek() method sets the file's read-write pointer to the point in the file where access is to begin. Its argument...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist download font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY