# \[Sydney\] Numerical computing with functions in Julia - 16 Nov 2017

**URL:** <https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836>\
**Category:** Meetups\
**Tags:** meetup\
**Created:** [November 1, 2017, 11:28pm UTC](https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836 "2017-11-01T23:28:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [November 1, 2017, 11:28pm UTC](https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836/1 "2017-11-01T23:28:19Z")

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**Update**  
Although we didn’t get to record it this is the material from the presentation. It was very interesting!

[https://github.com/Julia-Sydney/Julia-Sydney-Talks/tree/master/20171116](https://github.com/Julia-Sydney/Julia-Sydney-Talks/tree/master/20171116)

**Numerical computing with functions in Julia**

**Presenter:** John Wormell

**Bio:** PhD student at the University of Sydney interested in numerical methods for dynamical systems, chaos, spectral bases ( [http://www.maths.usyd.edu.au/u/wormellj/](http://www.maths.usyd.edu.au/u/wormellj/) )

**Abstract:** While all we classically expect of a function in programming is that it produces outputs from inputs, knowledge of the function as a whole is really required for many operations: these include calculus operations, differential equation solving, root-finding and sampling from a distribution.  
This talk will introduce some Julia packages that implement various kinds of natural, highly efficient “whole-function” manipulation. It will focus on ForwardDiff.jl, which performs efficient automatic differentiation, and ApproxFun, which represents functions very accurately as a sum of Chebyshev polynomials and then solves many problems using numerical linear algebra. We will discuss in particular how these packages make use of Julia’s capabilities, including multiple dispatch and the parametric type system.

[https://www.meetup.com/Sydney-Julia-Julialang-Meetup/events/244733360/](https://www.meetup.com/Sydney-Julia-Julialang-Meetup/events/244733360/)

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**Author:** ![John\_Gibson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/john_gibson/32/5321_2.png) [@John\_Gibson](https://discourse.julialang.org/u/John_Gibson)\
**Post date:** [November 2, 2017, 11:30am UTC](https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836/2 "2017-11-02T11:30:33Z")

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I’d very much appreciate a video recording and/or access to the presentation materials. This is exactly what I need to learn about Julia right now!

BTW, the URL provided for the speaker bio appears to be broken.

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**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [November 2, 2017, 11:39am UTC](https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836/3 "2017-11-02T11:39:05Z")

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Thanks. URL is fixed. I will see if I get it recorded.

update: recording will not be available

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**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [November 19, 2017, 1:44am UTC](https://discourse.julialang.org/t/sydney-numerical-computing-with-functions-in-julia-16-nov-2017/6836/4 "2017-11-19T01:44:36Z")

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Although we didn’t get to record it this is the material from the presentation. It was very interesting!

[https://github.com/Julia-Sydney/Julia-Sydney-Talks/tree/master/20171116](https://github.com/Julia-Sydney/Julia-Sydney-Talks/tree/master/20171116)