Book Image

NumPy Cookbook - Second Edition

By : Ivan Idris
Book Image

NumPy Cookbook - Second Edition

By: Ivan Idris

Overview of this book

<p>NumPy has the ability to give you speed and high productivity. High performance calculations can be done easily with clean and efficient code, and it allows you to execute complex algebraic and mathematical computations in no time.</p> <p>This book will give you a solid foundation in NumPy arrays and universal functions. Starting with the installation and configuration of IPython, you'll learn about advanced indexing and array concepts along with commonly used yet effective functions. You will then cover practical concepts such as image processing, special arrays, and universal functions. You will also learn about plotting with Matplotlib and the related SciPy project with the help of examples. At the end of the book, you will study how to explore atmospheric pressure and its related techniques. By the time you finish this book, you'll be able to write clean and fast code with NumPy.</p>
Table of Contents (19 chapters)
NumPy Cookbook Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Profiling code with the cProfile extension


cProfile is a C extension introduced in Python 2.5. It can be used for deterministic profiling. Deterministic profiling means that the time measurements obtained are precise and no sampling is used. This contrasts with statistical profiling, where measurements come from random samples. We will profile a small NumPy program using cProfile, which transposes an array with random values.

How to do it...

Again, we require code to profile:

  1. Write the following transpose() function to create an array with random values and transpose it:

    def transpose(n):
      random_values = np.random.random((n, n))
      return random_values.T
  2. Run the profiler and give it the function to profile:

    cProfile.run('transpose (1000)')

    The complete code for this tutorial can be found in the following snippet:

    import numpy as np
    import cProfile
    
    def transpose(n):
       random_values = np.random.random((n, n))
       return random_values.T
    
    cProfile.run('transpose (1000)')

    For a 1000 x 1000 array, we...