Search icon Close icon
Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Checkout

Change country

Modal Close icon
Country selected Country selected
country flag United States
Country selected
country flag Great Britain
Country selected
country flag India
Country selected
country flag Germany
Country selected
country flag France
Country selected
country flag Canada
Country selected
country flag Russia
Country selected
country flag Spain
Country selected
country flag Brazil
Country selected
country flag Australia
Country selected
country flag Singapore
Country selected
country flag Hungary
Country selected
country flag Ukraine
Country selected
country flag Luxembourg
Country selected
country flag Estonia
Country selected
country flag Lithuania
Country selected
country flag South Korea
Country selected
country flag Turkey
Country selected
country flag Switzerland
Country selected
country flag Colombia
Country selected
country flag Taiwan
Country selected
country flag Chile
Country selected
country flag Norway
Country selected
country flag Ecuador
Country selected
country flag Indonesia
Country selected
country flag New Zealand
Country selected
country flag Cyprus
Country selected
country flag Denmark
Country selected
country flag Finland
Country selected
country flag Poland
Country selected
country flag Malta
Country selected
country flag Czechia
Country selected
country flag Austria
Country selected
country flag Sweden
Country selected
country flag Italy
Country selected
country flag Egypt
Country selected
country flag Belgium
Country selected
country flag Portugal
Country selected
country flag Slovenia
Country selected
country flag Ireland
Country selected
country flag Romania
Country selected
country flag Greece
Country selected
country flag Argentina
Country selected
country flag Netherlands
Country selected
country flag Bulgaria
Country selected
country flag Latvia
Country selected
country flag South Africa
Country selected
country flag Malaysia
Country selected
country flag Japan
Country selected
country flag Slovakia
Country selected
country flag Philippines
Country selected
country flag Mexico
Country selected
country flag Thailand
Country selected
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Newsletter Hub
Free Learning
Arrow right icon
timer SALE ENDS IN
0 Days
:
00 Hours
:
00 Minutes
:
00 Seconds
Home > Data > Data Science > Julia Cookbook
Julia Cookbook
Julia Cookbook

Julia Cookbook: Over 40 recipes to get you up and running with programming using Julia

Arrow left icon
Profile Icon Raj R Jalem Profile Icon Rohit
Arrow right icon
€8.99 €26.99
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.3 (3 Ratings)
eBook Sep 2016 172 pages 1st Edition
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m
Arrow left icon
Profile Icon Raj R Jalem Profile Icon Rohit
Arrow right icon
€8.99 €26.99
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.3 (3 Ratings)
eBook Sep 2016 172 pages 1st Edition
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

Contact Details

Modal Close icon
Payment Processing...
tick Completed

Billing Address

Table of content icon View table of contents Preview book icon Preview Book

Julia Cookbook

Chapter 2. Metaprogramming

In this chapter, we will cover the following recipes:

  • Representation of a Julia program
  • Programs for metaprogramming
  • Expressions and functions for metaprogramming
  • Macros
  • Advanced concepts in macros
  • Function and code generation

Introduction

Metaprogramming is a concept where by a language can express its own code as a data structure of itself. For example, Lisp expresses code in the form of Lisp arrays, which are data structures in Lisp itself. Similarly, even Julia can express its code as data structures.

This makes it possible for Julia to generate and transform code through a Julia program. Julia has really nice reflection properties. So, the property of metaprogramming makes it easy to handle repetitive programming and function execution in data science and, especially, while handling big data in the Map Reduce framework.

Representation of a Julia program

In this section, you will study the life of a Julia program and how it is actually represented and interpreted by Julia. You will also learn what is meant by "a language expressing its own code as a data structure of itself."

This section will act as a foundation for learning about the concept of metaprogramming and how Julia uses it for generating code.

Getting ready

To get started with this section, you must simply have your Julia REPL up-and-running.

How to do it...

Firstly, it is very important to know that every Julia program starts out as a string. Let's consider a short program for adding two variables as our Julia code and use it to learn how Julia interprets programs:

code = "a + b"

It would look like this:

How to do it...

Now, if you parse the preceding string code, it would return an object of type Expression. Let's check it by actually parsing an example Julia program and checking for its type:

check = parse(code)

The output would...

Symbols and expressions

In this section, you will learn about symbols and expressions in detail. They have a syntactic importance in the metaprogramming concepts of Julia. So, this section would explain them in detail, so as to appreciate the concepts covered so far and those to follow.

Symbols

Symbols are the basic blocks of expressions. They are used for concatenating two strings together. They are also used as interned strings while building expressions.

Getting ready

There aren't any major requirements for this chapter. The only requirement is that your Julia REPL should be up and running.

How to do it...

Symbols can take in some arguments and then return the concatenated string of the string representations of those arguments. This is an example of how you can do it in the REPL:

  • symbol("FirstName", "LastName")

    The output of the preceding command would look like this:

    How to do it...

  • symbol("FirstName", 45)

    The output of the preceding command would look like this:

    How to do it...

  • symbol("Foo", :Bar, 86)

    The output of the preceding command would look like:

    How to do it...

Symbols create interned strings that are used for building expressions. An interned string is an immutable string that is used during string processing for optimizing time and space. The character : is used...

Quoting

The usage of a semicolon to represent expressions is known as quoting. The characters inside the parentheses after the semicolon constitute an Expression object.

How to do it...

To check this behavior, let's check for the type of a similar statement that has an object inside the parentheses after a semicolon. This can be done in the REPL as follows:

typeof(:((a + b) * c) / 6))

The preceding command gives the following output:

How to do it...

Multiple expressions can be represented as a block by quoting them. The syntax would be as follows:

exp = quote
              some code
              some more code
              more code
              a little more
              ...
           end

An example with some code inside the code block would look like this:

How to do it...

Now, let's verify the type of the exp variable with the typeof() function.

How to do it...

So, the the code block enclosed inside quote and end is indeed an expression.

How it works...

Quoting is the concept of creating expression objects...

Interpolation

Sometimes, construction on Expression objects is difficult, especially when you have multiple objects and/or variables. This is used for easy and readable expression construction.

So, interpolation is a way to deal with this. Such objects can be interpolated into the expression construction through a $ prefix. This process is also called splicing expressions, variables, or literals into quoted expressions.

How to do it...

Suppose there is a literal p, which has to be interpolated for constructing an expression with other literals; this is how it would be done:

p = 6;
exp = :(20 + $p)

This is how it would look:

How to do it...

For nested quoting, each symbol must be quoted separately, along with splicing the overall parentheses of the nested expression:

p = 6;
q = 7;
:(:p in $(  :(:p * :q ) ) )

This is how it would look in the REPL:

How to do it...

Even data structures can be spliced into an expression construction. Now, let's consider the tuple data structure for splicing into an expression builder...

Introduction

Metaprogramming is a concept where by a language can express its own code as a data structure of itself. For example, Lisp expresses code in the form of Lisp arrays, which are data structures in Lisp itself. Similarly, even Julia can express its code as data structures.

This makes it possible for Julia to generate and transform code through a Julia program. Julia has really nice reflection properties. So, the property of metaprogramming makes it easy to handle repetitive programming and function execution in data science and, especially, while handling big data in the Map Reduce framework.

Representation of a Julia program

In this section, you will study the life of a Julia program and how it is actually represented and interpreted by Julia. You will also learn what is meant by "a language expressing its own code as a data structure of itself."

This section will act as a foundation for learning about the concept of metaprogramming and how Julia uses it for generating code.

Getting ready

To get started with this section, you must simply have your Julia REPL up-and-running.

How to do it...

Firstly, it is very important to know that every Julia program starts out as a string. Let's consider a short program for adding two variables as our Julia code and use it to learn how Julia interprets programs:

code = "a + b"

It would look like this:

Now, if you parse the preceding string code, it would return an object of type Expression. Let's check it by actually parsing an example Julia program and checking for its type:

check = parse(code)

The output would look like this:

You will learn...

Symbols and expressions

In this section, you will learn about symbols and expressions in detail. They have a syntactic importance in the metaprogramming concepts of Julia. So, this section would explain them in detail, so as to appreciate the concepts covered so far and those to follow.

Left arrow icon

Page 1 of 10

Right arrow icon

Key benefits

  • Follow a practical approach to learn Julia programming the easy way
  • Get an extensive coverage of Julia’s packages for statistical analysis
  • This recipe-based approach will help you get familiar with the key concepts in Julia

Description

Want to handle everything that Julia can throw at you and get the most of it every day? This practical guide to programming with Julia for performing numerical computation will make you more productive and able work with data more efficiently. The book starts with the main features of Julia to help you quickly refresh your knowledge of functions, modules, and arrays. We’ll also show you how to utilize the Julia language to identify, retrieve, and transform data sets so you can perform data analysis and data manipulation. Later on, you’ll see how to optimize data science programs with parallel computing and memory allocation. You’ll get familiar with the concepts of package development and networking to solve numerical problems using the Julia platform. This book includes recipes on identifying and classifying data science problems, data modelling, data analysis, data manipulation, meta-programming, multidimensional arrays, and parallel computing. By the end of the book, you will acquire the skills to work more effectively with your data.

Who is this book for?

This book is for data scientists and data analysts who are familiar with the basics of the Julia language. Prior experience of working with high-level languages such as MATLAB, Python, R, or Ruby is expected.

What you will learn

  • Extract and handle your data with Julia
  • Uncover the concepts of metaprogramming in Julia
  • Conduct statistical analysis with StatsBase.jl and Distributions.jl
  • Build your data science models
  • Find out how to visualize your data with Gadfly
  • Explore big data concepts in Julia

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 30, 2016
Length: 172 pages
Edition : 1st
Language : English
ISBN-13 : 9781785883637
Category :
Data
Languages :
Julia
Concepts :
Data Science

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

Contact Details

Modal Close icon
Payment Processing...
tick Completed

Billing Address

Product Details

Publication date : Sep 30, 2016
Length: 172 pages
Edition : 1st
Language : English
ISBN-13 : 9781785883637
Category :
Data
Languages :
Julia
Concepts :
Data Science

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
START FREE TRIAL
BUY NOW
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW

Frequently bought together

Julia for Data Science
Julia for Data Science
Read more
Sep 2016 346 pages
Full star icon 4.5 (6)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €41.99
€8.99 €32.99
€41.99
Julia Cookbook
Julia Cookbook
Read more
Sep 2016 172 pages
Full star icon 2.3 (3)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €32.99
€8.99 €26.99
€32.99
Julia: High Performance Programming
Julia: High Performance Programming
Read more
Nov 2016 697 pages
Course
Course
€74.99
Stars icon
Total € 149.97
Julia for Data Science
€41.99
Julia Cookbook
€32.99
Julia: High Performance Programming
€74.99
Total € 149.97 Stars icon
Banner background image

Table of Contents

6 Chapters
1. Extracting and Handling Data Chevron down icon Chevron up icon
1. Extracting and Handling Data
Introduction
Why should we use Julia for data science?
Handling data with CSV files
Handling data with TSV files
Working with databases in Julia
Interacting with the Web
2. Metaprogramming Chevron down icon Chevron up icon
2. Metaprogramming
Introduction
Representation of a Julia program
Symbols and expressions
Symbols
Quoting
Interpolation
The Eval function
Macros
Metaprogramming with DataFrames
3. Statistics with Julia Chevron down icon Chevron up icon
3. Statistics with Julia
Introduction
Basic statistics concepts
Descriptive statistics
Deviation metrics
Sampling
Correlation analysis
4. Building Data Science Models Chevron down icon Chevron up icon
4. Building Data Science Models
Introduction
Dimensionality reduction
Linear discriminant analysis
Data preprocessing
Linear regression
Classification
Performance evaluation and model selection
Cross validation
Distances
Distributions
Time series analysis
5. Working with Visualizations Chevron down icon Chevron up icon
5. Working with Visualizations
Introduction
Plotting basic arrays
Plotting dataframes
Plotting functions
Exploratory data analytics through plots
Line plots
Scatter plots
Histograms
Aesthetic customizations
6. Parallel Computing Chevron down icon Chevron up icon
6. Parallel Computing
Introduction
Basic concepts of parallel computing
Data movement
Parallel maps and loop operations
Channels

Recommendations for you

Left arrow icon
LLM Engineer's Handbook
LLM Engineer's Handbook
Read more
Oct 2024 522 pages
Full star icon 4.8 (17)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €54.99
€8.99 €43.99
€54.99
Getting Started with Tableau 2018.x
Getting Started with Tableau 2018.x
Read more
Sep 2018 396 pages
Full star icon 4 (3)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €41.99
€8.99 €32.99
€41.99
Semantic Kernel SDK for Intelligent Applications
Semantic Kernel SDK for Intelligent Applications
Read more
Dec 2024 2hrs 9mins
Video
Video
  • Video Video €8.99
€8.99 €82.99
AI Ecosystem for the Absolute Beginners - Hands-On
AI Ecosystem for the Absolute Beginners - Hands-On
Read more
Dec 2024 4hrs 56mins
Video
Video
  • Video Video €8.99
€8.99 €81.99
Python for Algorithmic Trading Cookbook
Python for Algorithmic Trading Cookbook
Read more
Aug 2024 404 pages
Full star icon 4.6 (15)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €44.99
€8.99 €35.99
€44.99
RAG-Driven Generative AI
RAG-Driven Generative AI
Read more
Sep 2024 334 pages
Full star icon 4.5 (13)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €40.99
€8.99 €32.99
€40.99
Machine Learning with PyTorch and Scikit-Learn
Machine Learning with PyTorch and Scikit-Learn
Read more
Feb 2022 774 pages
Full star icon 4.4 (95)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €41.99
€8.99 €32.99
€41.99
Building LLM Powered Applications
Building LLM Powered Applications
Read more
May 2024 342 pages
Full star icon 4.2 (22)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Python Machine Learning By Example
Python Machine Learning By Example
Read more
Jul 2024 518 pages
Full star icon 4.9 (8)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €34.99
€8.99 €27.99
€34.99
AI Product Manager's Handbook
AI Product Manager's Handbook
Read more
Nov 2024 484 pages
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Right arrow icon

Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.3
(3 Ratings)
5 star 0%
4 star 0%
3 star 66.7%
2 star 0%
1 star 33.3%
Kindle Customer Mar 02, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
If you don't know the language and/or have minimal programming experience, this could be a good resource. If you're looking for the definitive 'Advanced Julia Developer's Guide', look elsewhere (and please let me know if you find it)...
Amazon Verified review Amazon
MSE fanatic Feb 10, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
I bought this book because I wanted to extend my Julia knowledge and capabilities. The book is fairly good, it covers a lot of data sciences related Julia packages and examples on how to do trivial tasks like reading files or performing an analysis of data. However, I was hoping since the book is titled as being a cookbook, there would be more examples of best methods for programming algorithms in Julia. I was anticipating a book more like a short numerical recipes book in Julia. Also, if the price for the printed version was around $15-20, I would have given this 4-stars.
Amazon Verified review Amazon
KarEl BrightShooster Feb 05, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Im Grunde kann man die Inhalte des Buches in den help-pages von julia-lang nachlesen, das ist zu wenig Mehrwert in diesem Buch
Amazon Verified review Amazon

People who bought this also bought

Left arrow icon
Causal Inference and Discovery in Python
Causal Inference and Discovery in Python
Read more
May 2023 456 pages
Full star icon 4.5 (49)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €29.99
€8.99 €23.99
€29.99
Generative AI with LangChain
Generative AI with LangChain
Read more
Dec 2023 368 pages
Full star icon 4 (34)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Modern Generative AI with ChatGPT and OpenAI Models
Modern Generative AI with ChatGPT and OpenAI Models
Read more
May 2023 286 pages
Full star icon 4.2 (34)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Deep Learning with TensorFlow and Keras – 3rd edition
Deep Learning with TensorFlow and Keras – 3rd edition
Read more
Oct 2022 698 pages
Full star icon 4.6 (45)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Machine Learning Engineering with Python
Machine Learning Engineering with Python
Read more
Aug 2023 462 pages
Full star icon 4.6 (36)
eBook
eBook
  • eBook eBook €8.99
  • Paperback Paperback €37.99
€8.99 €29.99
€37.99
Right arrow icon

About the authors

Left arrow icon
Profile icon Raj R Jalem
Raj R Jalem
Read more
See other products by Raj R Jalem
Profile icon Rohit
Rohit
Jalem Raj Rohit is an IIT Jodhpur graduate with a keen interest in recommender systems, machine learning, and serverless and distributed systems. Raj currently works as a senior consultantdata scienceand NLP at Episource, before which he worked at Zomato and Kayako. He contributes to open source projects in Python, Go, and Julia. He also speaks at tech conferences about serverless engineering and machine learning.
Read more
See other products by Rohit
Right arrow icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

How do I buy and download an eBook? Chevron down icon Chevron up icon

Where there is an eBook version of a title available, you can buy it from the book details for that title. Add either the standalone eBook or the eBook and print book bundle to your shopping cart. Your eBook will show in your cart as a product on its own. After completing checkout and payment in the normal way, you will receive your receipt on the screen containing a link to a personalised PDF download file. This link will remain active for 30 days. You can download backup copies of the file by logging in to your account at any time.

If you already have Adobe reader installed, then clicking on the link will download and open the PDF file directly. If you don't, then save the PDF file on your machine and download the Reader to view it.

Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.