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Eli Bressert - SciPy and NumPy: An Overview for Developers

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Eli Bressert SciPy and NumPy: An Overview for Developers
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Want to learn SciPy and NymPy quickly? Cut through the complexity of online documentation with this concise and illustrated book, and discover how easily you can get up to speed with these Python libraries. Youll understand why theyre powerful enough for many of todays leading scientists and engineers.
Learn how to use NumPy for numerical processing, including array indexing, math operations, and loading and saving data. With SciPy, youll work with advanced mathematical functions such as optimization, interpolation, integration, clustering, statistics, and other tools that take scientific programming to a whole new level. This book also introduces add-on SciKits packages that focus on advanced imaging algorithms and machine learning.

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SciPy and NumPy
Eli Bressert
Published by OReilly Media

Beijing Cambridge Farnham Kln Sebastopol Tokyo Preface Python a high-level - photo 1

Beijing Cambridge Farnham Kln Sebastopol Tokyo

Preface

Python, a high-level language with easy-to-read syntax, is highly flexible, which makes it an ideal language to learn and use. For science and R&D, a few extra packages are used to streamline the development process and obtain goals with the fewest steps possible. Among the best of these are SciPy and NumPy. This book gives a brief overview of different tools in these two scientific packages, in order to jump start their use in the readers own research projects.

NumPy and SciPy are the bread-and-butter Python extensions for numerical arrays and advanced data analysis. Hence, knowing what tools they contain and how to use them will make any programmers life more enjoyable. This book will cover their uses, ranging from simple array creation to machine learning.

Audience

Anyone with basic (and upward) knowledge of Python is the targeted audience for this book. Although the tools in SciPy and NumPy are relatively advanced, using them is simple and should keep even a novice Python programmer happy.

Contents of this Book

This book covers the basics of SciPy and NumPy with some additional material. The first chapter describes what the SciPy and NumPy packages are, and how to access and install them on your computer. , the conclusion, we discuss what to do next for even more advanced material.

Conventions Used in This Book

The following typographical conventions are used in this book:

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Indicates menu titles, menu options, menu buttons, and keyboard accelerators (such as Alt and Ctrl).

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Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: SciPy and NumPy by Eli Bressert (OReilly). Copyright 2013 Eli Bressert, 978-1-449-30546-8.

If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .

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Acknowledgments

I would like to thank Meghan Blanchette and Julie Steele, my current and previous editors, for their patience, help, and expertise. This book wouldnt have materialized without their assistance. The tips, warnings, and package tools discussed in the book were much improved thanks to the two book reviewers: Tom Aldcroft and Sarah Kendrew. Colleagues and friends that have helped discuss certain aspects of this book and bolstered my drive to get it done are Leonardo Testi, Nate Bastian, Diederik Kruijssen, Joao Alves, Thomas Robitaille, and Farida Khatchadourian. A big thanks goes to my wife and son, Judith van Raalten and Taj Bressert, for their help and inspiration, and willingness to deal with me being huddled away behind the computer for endless hours.

Chapter 1. Introduction

Python is a powerful programming language when considering portability, flexibility, syntax, style, and extendability. The language was written by Guido van Rossum with clean syntax built in. To define a function or initiate a loop, indentation is used instead of brackets. The result is profound: a Python programmer can look at any given uncommented Python code and quickly understand its inner workings and purpose.

Compiled languages like Fortran and C are natively much faster than Python, but not necessarily so when Python is bound to them. Using packages like Cython enables Python to interface with C code and pass information from the C program to Python and vice versa through memory. This allows Python to be on par with the faster languages when necessary and to use legacy code (e.g., FFTW ). The combination of Python with fast computation has attracted scientists and others in large numbers. Two packages in particular are the powerhouses of scientific Python: NumPy and SciPy. Additionally, these two packages makes integrating legacy code easy.

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