Book Image

Time Series Indexing

By : Mihalis Tsoukalos
Book Image

Time Series Indexing

By: Mihalis Tsoukalos

Overview of this book

Time series are everywhere, ranging from financial data and system metrics to weather stations and medical records. Being able to access, search, and compare time series data quickly is essential, and this comprehensive guide enables you to do just that by helping you explore SAX representation and the most effective time series index, iSAX. The book begins by teaching you about the implementation of SAX representation in Python as well as the iSAX index, along with the required theory sourced from academic research papers. The chapters are filled with figures and plots to help you follow the presented topics and understand key concepts easily. But what makes this book really great is that it contains the right amount of knowledge about time series indexing using the right amount of theory and practice so that you can work with time series and develop time series indexes successfully. Additionally, the presented code can be easily ported to any other modern programming language, such as Swift, Java, C, C++, Ruby, Kotlin, Go, Rust, and JavaScript. By the end of this book, you'll have learned how to harness the power of iSAX and SAX representation to efficiently index and analyze time series data and will be equipped to develop your own time series indexes and effectively work with time series data.
Table of Contents (11 chapters)

Storing an iSAX index in JSON format

For the visualizations of this chapter, we are going to use the low-level D3.js JavaScript library.

Is D3.js the only way to create visualizations?

The powerful D3.js JavaScript library is not a panacea and therefore, it is not the only way to create visualizations. There exist many Python packages that are good at plotting data, as well as programming languages such as R or Julia. However, JavaScript can be used for presenting your plots in a web page environment, which is not usually the case with the other options.

For the JavaScript D3.js code to work, we need to represent an iSAX index in JSON format so that it can be understood by the JavaScript code – we mainly need to represent the structure and the connections between iSAX nodes in a way that can be understood by a computer and a programming language. Therefore, the first step we should take is to convert an iSAX index representation with its structures from Python code...