Book Image

Julia 1.0 Programming - Second Edition

By : Ivo Balbaert
Book Image

Julia 1.0 Programming - Second Edition

By: Ivo Balbaert

Overview of this book

The release of Julia 1.0 is now ready to change the technical world by combining the high productivity and ease of use of Python and R with the lightning-fast speed of C++. Julia 1.0 programming gives you a head start in tackling your numerical and data problems. You will begin by learning how to set up a running Julia platform, before exploring its various built-in types. With the help of practical examples, this book walks you through two important collection types: arrays and matrices. In addition to this, you will be taken through how type conversions and promotions work. In the course of the book, you will be introduced to the homo-iconicity and metaprogramming concepts in Julia. You will understand how Julia provides different ways to interact with an operating system, as well as other languages, and then you'll discover what macros are. Once you have grasped the basics, you’ll study what makes Julia suitable for numerical and scientific computing, and learn about the features provided by Julia. By the end of this book, you will also have learned how to run external programs. This book covers all you need to know about Julia in order to leverage its high speed and efficiency for your applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Packt Upsell


Like C or Java, but unlike Python, Julia implements a type for a single character, the Char type. A character literal is written as 'A', where typeof('A') returns Char. A Char value is a Unicode code point, and it ranges from '\0' to '\Uffffffff'. Convert this to its code point with Int(): Int('A') returns 65, and Int('α') returns 945, so this takes two bytes.

The reverse also works: Char(65) returns 'A', Char(945) returns '\u3b1', which is the code point for α (3b1 is hexadecimal for 945).

Unicode characters can be entered by a \u in single quotes, followed by four hexadecimal digits (ranging from 0-9 or A-F), or \U followed by eight hexadecimal digits. The isvalid(Char, value) function can test whether a number returns an existing Unicode character: isvalid(Char,0x3b1) returns true. The normal escape characters, such as \t (tab), \n (newline), \', and so on, also exist in Julia.