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NumPy Beginner's Guide

NumPy Beginner's Guide

By : Ivan Idris
4.2 (14)
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NumPy Beginner's Guide

NumPy Beginner's Guide

4.2 (14)
By: Ivan Idris

Overview of this book

NumPy is an extension to, and the fundamental package for scientific computing with Python. In today's world of science and technology, it is all about speed and flexibility. When it comes to scientific computing, NumPy is on the top of the list. NumPy Beginner's Guide will teach you about NumPy, a leading scientific computing library. NumPy replaces a lot of the functionality of Matlab and Mathematica, but in contrast to those products, is free and open source. Write readable, efficient, and fast code, which is as close to the language of mathematics as is currently possible with the cutting edge open source NumPy software library. Learn all the ins and outs of NumPy that requires you to know basic Python only. Save thousands of dollars on expensive software, while keeping all the flexibility and power of your favourite programming language.You will learn about installing and using NumPy and related concepts. At the end of the book we will explore some related scientific computing projects. This book will give you a solid foundation in NumPy arrays and universal functions. Through examples, you will also learn about plotting with Matplotlib and the related SciPy project. NumPy Beginner's Guide will help you be productive with NumPy and have you writing clean and fast code in no time at all.
Table of Contents (19 chapters)
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Numpy Beginner's Guide Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – asserting almost equal


Imagine that you have two numbers that are almost equal. Let's use the assert_almost_equal function to check whether they are equal:

  1. Call the function with low precision (up to seven decimal places):

    print "Decimal 6", np.testing.assert_almost_equal(0.123456789,0.123456780, decimal=7)

    Note that no exception is raised, as you can see in the following result:

    Decimal 6 None
  2. Call the function with higher precision (up to eight decimal places):

    print "Decimal 7", np.testing.assert_almost_equal(0.123456789, 0.123456780, decimal=8)

    The result is:

    Decimal 7
    Traceback (most recent call last):
      …
    raiseAssertionError(msg)
    AssertionError:
    Arrays are not almost equal
     ACTUAL: 0.123456789
     DESIRED: 0.12345678

What just happened?

We used the assert_almost_equal function from the NumPy testing package to check whether 0.123456789 and 0.123456780 are equal for different decimal precision.

Pop quiz – specifying decimal precision

Q1. Which parameter of the assert_almost_equal...

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