[Gretl-devel] moving averages

Hi, I was looking for a way to apply moving average filters to a time series. To my understanding there isn't a built-in function in gretl, so I would like to know whether some user has already developed it. If not, I think I will write a user function (I need it to show its properties to my students). In this case, I would like to know whether is available the convolution function in gretl, which is very helpful to combine filters. Any suggestion is obviously welcome! Thanks a lot. Marco