In our last post, we explored how Fourier transforms can be used in Mathematica to make a frequency filter for audio files. That post was primarily concerned with implementing the appropriate transforms (and, of course, paying homage to the amazing talent of Macklemore and Ryan Lewis).

The Heist by Macklemore and Ryan Lewis is a masterpiece. It is clearly the best album of 2012, and I suspect it will go down alongside classics like Illmatic, The Chronic, The Marshall Mathers LP, and The College Dropout.

The people behind the wonderful RStudio, which I gushed about in a previous post, have developed a new package, Shiny, that makes it easy to develop interactive web applications with R.