Dirk Eddelbuettel on Rcpp
Dirk Eddelbuettel gave a keynote on Rcpp [slides]. The goal of Rcpp is to have “the speed of C++ with the ease and clarity of R.” He gave a series of examples that left me (who still uses
.C() to access C code) thinking, “Holy crap this is so much easier than what I do!”
Dirk ended with a detailed discussion of Docker: a system for virtual machines as portable containers. I didn’t fully appreciate this part, but according to Dirk, Docker “changes how we build and test R….It’s like pushing to GitHub.”
After Dirk’s talk was the Sponsor’s Talk. But if I’m going to skip a session (and I strongly recommend that you skip at least some sessions at any conference), anything called “Sponsor’s Talk” is going to be high on my list to skip.
Lunch at Venice Beach
R and reproducibility
For your R-based project to be reproducible, the many packages that you’ve used need to be available. And future versions of those packages may not work the same way, so ideally you should keep copies of the particular versions that you used.
David Smith spoke about the R reproducibility toolkit (RRT). The focus was more on business analytics, and the need to maintain a group of versioned packages that are known to work together. CRAN runs checks on all packages so that they’re all known to work together. As I understand it, RRT manages snapshots of sets of packages from CRAN.
I’ve not thought much about this issue. packrat seems the best fit for my sort of work. I should start using it.
The second poster session was in a different location with more space. It was still a bit cramped, being in a hallway, but it was way better than the first day. There were a number of interesting posters, including Hilary’s on testdat, for testing CSV files; Sandy’s on using Shiny apps for teaching; and Mine Çetinkaya-Rundel and Andrew Bray’s poster on “Teaching data analysis in R through the lens of reproducibility” [pdf].
Met more folks
The main purpose of conferences is to meet people. I was glad to be able to chat with Dirk Eddelbuettel, Ramnath Vaidyanathan, and also Tim Triche. Also karaoke with Sandy, Karthik, Hilary, Rasmus, and Romain.
Wish I’d seen
I had a bit of a late night on Wednesday night, and then I was in a hurry to get down (via public transit!) to the Science Center to meet up with my family. So I’m sorry that I didn’t get to see Yihui Xie’s talk on Knitr Ninja.
Looking back through the program, there are a number of other talks I wish I’d seen:
Romain Francois on Rcpp11 [slides]
Rasmus Baath on Bayesian First Aid [slides]
Nicholas Reich on statsTeachR.org
Amelia McNamara on Teaching R to high school students (and teachers)
Jeff Allen on the latest with R Markdown [slides]