Fantastic presentations from R using slidify and rCharts

Ramnath Vaidynathan presenting in DCDr. Ramnath Vaidyanathan of McGill University gave an excellent presentation at a joint Data Visualization DC/Statistical Programming DC event on Monday, August 19 at nclud, on two R projects he leads -- slidify and rCharts. After the evening, all I can say is, Wow!! It's truly impressive to see what can be achieved in presentation and information-rich graphics directly from R. Again, wow!! (I think many of the attendees shared this sentiment)


Slidify is a R package that

helps create, customize and share elegant, dynamic and interactive HTML5 documents through R Markdown.

We have blogged about slidify, but it was great to get an overview of slidify directly from the creator. Dr. Vaidyanathan explained that the underlying principle in developing slidify is the separation of the content and the appearance and behavior of the final product. He achieves this using HTML5 frameworks, layouts and widgets which are customizable (though he provides several here and through his slidifyExamples R package).

Example RMarkdown file for slidify

You start with a modified R Markdown file as seen here. This file can have chunks of R code in it. It is then processed to a pure Markdown file, interlacing the output of R code into the file. This is then split-apply-combined to produce the final HTML5 document. This document can be shared using GitHub, Dropbox or RPubs directly from R. Dr. Vaidyanathan gave examples of how slidify can even be used to create interactive quizzes or even interactive documents utilizing slidify and Shiny.

One really neat feature he demonstrated is the ability to embed an interactive R console within a slidify presentation. He explained that this used a Shiny server backend locally, or an OpenCPU backend if published online. This feature changes how presentations can be delivered, by not forcing the presenter to bounce around between windows but actually demonstrate within the presentations.


rCharts is

an R package to create, customize and share interactive visualizations, using a lattice-like formula interface

Again, we have blogged about rCharts, but there have been several advances in the short time since then, both in rCharts and interactive documents that Dr. Vaidyanathan has developed.

rCharts creates a formula-driven interface to several Javascript graphics frameworks, including NVD3, Highcharts, Polycharts and Vega. This formula interface is familiar to R users, and makes the process of creating these charts quite straightforward. Some customization is possible, as well as putting in basic controls without having to use Shiny. We saw several examples of excellent interactive charts using simple R commands. There is even a gallery where users can contribute their rCharts creations. There is really no excuse any more for avoiding these technologies for visualization, and it makes life so much more interesting!!

Bikeshare maps, or how to create stellar interactive visualizations using R and Javascript

Dr. Vaidyanathan demonstrated one project which, I feel, shows the power of the technologies he is developing using R and Javascript. He created a web application using R, Shiny, his rCharts packages which accesses the Leaflet Javascript library, and a very little bit of Javascript magic to visualize the availability of bicycles at different stations in a bike sharing network. This application can automatically download real-time data and visualize availability in over 100 bike sharing systems worldwide. He focused on the London bike share map, which was fascinating in that it showed how bikes had moved from the city to the outer fringes at night. Clicking on any dot showed how many bikes were available at that station.

London Bike Share map Dr. Vaidyanathan quickly demonstrated a basic process of how to map points on a city map, how to change their appearance and how to add additional meta-data to each point, that will appear as a pop-up when clicked.

You can see the full project and how Dr. Vaidyanathan developed this application here.

Interactive learning environments

Finally, Dr. Vaidyanathan showed a new application he is developing using slidify, rCharts, and other open-source technologies like OpenCPU and PopcornJS. This application allows him to author a lesson in R Markdown, integrate interactive components including interactive R consoles, record the lesson as a screencast, sync the screencast with the slides, and publish it. This seems to me to be one possible future for presenting massive online courses. An example presentation is available here, and the project is hosted here

Open presentation

The presentation and all the relevant code and demos are hosted on GitHub, and the presentation can be seen (developed using slidify, naturally) here.

Stay tuned for an interview I did with Dr. Vaidyanathan earlier, which will be published here shortly.

Have fun using these fantastic tools in the R ecosystem to make really cool, informative presentations of your data projects. See you next time!!!

Data-driven presentations using Slidify

Presentations are the stock-in-trade for consultants, managers, teachers, public speakers, and, probably, you. We all have to present our work at some level, to someone we report to or to our peers, or to introduce newcomers to our work. Of course, presentations are passe, so why blog about it? There’s already PowerPoint, and maybe Keynote. What more need we talk about? slidify

Well, technology has changed, and vibrant dynamic presentations are here today for everyone to see. No, I mean literally everybody, if I like. All anyone will need is a web browser to see it. Graphs can be interactive, flow can be nonlinear, and presentations can be fun and memorable again!

But PowerPoint is so easy! You click, paste, type, add a bit of glitz, and you’re done, right? Well, as most of us can attest to, not really. It takes a bit more effort and putzing around to really get things in reasonable shape, let alone great shape.

And there are powerful alternatives. Which are simple and easy. And do a pretty great job on their own. Oh, and, by the way, if you have data and analysis results to present, super slick and a one-stop-shop from analysis to presentation. Really!! Actually there are a few out there, but I’m going to talk about just one. My favorite. Slidify.

Slidify is a fantastic R package that takes a document written in RMarkdown , which is Markdown (an easy text markup format) possibly interspersed with of R code that result in tables or figures or interactive graphics, weaves in the results of that code, and then formats it into beautiful web presentations using HTML5. You can decide on the format template ( it comes with quite a few) or brew your own. You can make your presentation look and behave the way you want, even like a Prezi (using ImpressJS). You can also make interactive questionnaires and even put in windows to code interactively within your presentation!!

A Slidify Demonstration

Slidify is obviously feature-rich, and infinitely customizable, but that’s not really what attracted me to it. It was the ability to write presentations in Markdown, which is super easy and let’s me put down content quickly without worrying about appearance (Between you and me, I’m writing this post in Markdown, on a Nexus 7). It lets me weave in results of my analyses easily, keeping the code in one place within my document. So when my data changes, I can create an updated presentation literally with the press of a button. Markdown is geared to create HTML documents. Pandoc lets you create HTML presentations from Markdown, but not living, data driven presentations like Slidify. I get to put my presentations up on Github or on Rpubs, or even in my  Dropbox, directly using Slidify, share the link, and I’m good to go.

Dr. Ramnath Vaidyanathan created Slidify to help him teach more effectively at McGill University, where he is on the Desautels Faculty of Management. But, for me, it is now the goto place for creating presentations , even if I don’t need to incorporate data. If you’re an analyst and live in the R ecosystem, I highly recommend Slidify. If you don’t and use other tools, Slidify is a great reason to come and see what R can do for you. Even if it to just create great presentations. There are plenty of great examples of what’s possible at

If you are in the DC metro area, come see Slidify in action. Dr. Vaidyanathan presents at a joint Statistical Programming DC / Data Visualization DC meetup on both Slidify and his other brainchildren, rCharts (which can create really cool and dynamic visualizations from R, see Sean's blog) and rNotebook on August 19. See the announcements at SPDC and DVDC, sign up, and we’ll see you there.