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

Conditional evaluation

Conditional evaluation means that pieces of code are evaluated, depending on whether a Boolean expression is either true or false. The familiar if...elseif...else...end syntax is used here, which is as follows:

# code in Chapter 4\conditional.jl 
var = 7 
if var > 10 
    println("var has value $var and is bigger than 10.") 
elseif var < 10 
    println("var has value $var and is smaller than 10.") 
    println("var has value $var and is 10.") 
# => prints "var has value 7 and is smaller than 10."



The elseif (of which there can be more than one) or else branches are optional. The condition in the first branch is evaluated, only the code in that branch is executed when the condition is true, and so on; so only one branch ever gets evaluated. No parentheses around condition(s) are needed, but they can be used for clarity. Each expression tested must effectively result in a true or false value, and no other values (such as 0 or 1) are allowed.