title: Calculating moving average
body: <p>I'm trying to use R to calculate the moving average over a series of values in a matrix. There doesn't seem to be a <a href="http://www.statmethods.net/management/functions.html" rel="noreferrer">built-in function</a> in R that will allow me to calculate moving averages. Do any packages provide one? Or do I need to write my own?</p>