Code used in my answers on the DSP Stack Exchange site.
To access a question, use the NNNNN from the directory name QNNNNN and go to http://dsp.stackexchange.com/questions/NNNNN
Decided that the easiest way to learn R is to write code in it to solve problems, so this is it. This R code is not necessarily the best.
More recently, I switched to wanting to present solutions in Python as that seems to be more accessible to the DSP.SE community.