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; I'm still learning it as at 2015/10/15.