notebook.community

Julia 101

About myself

Georg Wechslberger (PhD)
Working at Technical University of Munich
Research Area: Numerical Analysis
Research Topic:
- Contour Optimatisation
- Riemann-Hilbert Problems

... or "Finding the shortest path to free beer."

Julia: History

development started in 2009 by Jeff Bezanson, Stefan Karpinski, Viral B. Shah, and Alan Edelman
public annoucment on 14.02.2012
first release v0.1 on 14.02.2013
current release v0.7
v1.0 expected to be released end 2017 / beginning 2018

Goal: "being greedy"

speed of good C code
usability of Python
Matlab like syntax
string handling tied in as in Perl
as easy as R for statistics
simple and interactive

Why should I use julia?

open source

usable free of charge
MIT License
growing community



In [1]:

    
Pkg.add("Requests")
using Requests









    



INFO: Package Requests is already installed
INFO: METADATA is out-of-date — you may not have the latest version of Requests
INFO: Use `Pkg.update()` to get the latest versions of your packages

active development



In [12]:

    
img = get("https://pkg.julialang.org/img/allver.svg");
display("image/svg+xml",String(img.data))

fast

But ... but ... all my existing code?

Matlab? -> similar syntax, just run it (with some modifications)
C / Fortran ? -> can be directly called, using build in interface
Python ? -> can be directly called, using PyCall interface
Mathematica ? -> can be directly called, using Mathematica.jl interface

Why shouldn't you use Julia?

really active development

breaking changes with every major release (might get better after v1.0
many packages are still in development
"the" package for a commmon usage pattern can change
package development may stop / switch to another approach



In [ ]: