Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Numpy Beginner's Guide (Update)
  • Table Of Contents Toc
  • Feedback & Rating feedback
Numpy Beginner's Guide (Update)

Numpy Beginner's Guide (Update)

By : Ivan Idris
2 (1)
close
close
Numpy Beginner's Guide (Update)

Numpy Beginner's Guide (Update)

2 (1)
By: Ivan Idris

Overview of this book

This book is for the scientists, engineers, programmers, or analysts looking for a high-quality, open source mathematical library. Knowledge of Python is assumed. Also, some affinity, or at least interest, in mathematics and statistics is required. However, I have provided brief explanations and pointers to learning resources.
Table of Contents (16 chapters)
close
close
14
C. NumPy Functions' References
15
Index

Time for action – creating universal functions

We can create a ufunc from a Python function with the NumPy the frompyfunc() function as follows:

  1. Define a Python function that answers the ultimate question to the universe, existence, and the rest (it's from The Hitchhiker's Guide to the Galaxy, Douglas Adam, Pan Books, if you haven't read it, you can safely ignore this!):
    def ultimate_answer(a):

    So far, nothing special; we gave the function the name ultimate_answer() and defined one parameter, a.

  2. Create a result consisting of all zeros that has the same shape as a, with the zeros_like() function:
    result = np.zeros_like(a)
  3. Now, set the elements of the initialized array to the answer 42 and return the result. The complete function should appear as shown in the following code snippet. The flat attribute gives us access to a flat iterator that allows us to set the value of the array.
    def ultimate_answer(a):
       result = np.zeros_like(a)
       result.flat = 42
       return result
  4. Create...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY