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)

Using the iSAX Python package

In this section, we are going to use the isax Python package to develop practical command-line utilities. But first, we are going to learn how to read the iSAX parameters from the users.

Reading the iSAX parameters

This subsection illustrates how to read the iSAX parameters, including the filenames with the time series, and how to give default values to some of them. Although we saw relevant code in Chapter 2, this time, the process is explained in more detail. Additionally, the code is also going to show how we use these input parameters to set up the relevant variables located inside the ./isax/variables.py file. As a reminder, variables stored in ./isax/variables.py, or other similar files – it just happens that we are using ./isax/variables.py – are accessible from anywhere in our code as long as we have successfully imported the relevant file.

What we need to create an iSAX index

As a reminder, to create an iSAX index, we...