Shiny

A Shiny Comrades Marathon Pacing App

The Comrades Marathon is an epic ultramarathon run each year between Durban and Pietermaritzburg (South Africa). A few years ago I put together a simple spreadsheet for generating a Comrades Marathon pacing strategy. But the spreadsheet was clunky to use and laborious to maintain. Plus I was frustrated by the crude plots (largely due to my limited spreadsheet proficiency). It seemed like an excellent opportunity to create a Shiny app.

Installing RStudio & Shiny Servers

I did a remote install of Ubuntu Server today. This was somewhat novel because it’s the first time that I have not had physical access to the machine I was installing on. The server install went very smoothly indeed. The next tasks were to install RStudio Server and Shiny Server. The installation process for each of these is well documented on the RStudio web site: Installing RStudio Server and Installing Shiny Server.

Review: Learning Shiny

I was asked to review Learning Shiny (HernĂ¡n G. Resnizky, Packt Publishing, 2015). I found the book to be useful, motivating and generally easy to read. I’d already spent some time dabbling with Shiny, but the book helped me graduate from paddling in the shallows to wading out into the Shiny sea.

Shiny Bayesian Updates

Reading Bayesian Computation with R by Jim Albert (Springer, 2009) inspired a fit of enthusiasm. Admittedly, I was on a plane coming back from Amsterdam and looking for distractions. I decided to put together a Shiny app to illustrate successive Bayesian updates. I had not yet seen anything that did this to my satisfaction. I like to think that my results come pretty close.

Hosting Shiny on Amazon EC2

I recently finished some work on a Shiny application which incorporated a Random Forest model. The model was stored in a RData file and loaded by server.R during initialisation. This worked fine when tested locally but when I tried to deploy the application on shinyapps.io I ran into a problem: evidently you can only upload server.R and ui.R files. Nothing else.

Comrades Marathon Medal Predictions