[Gretl-users] Exponential Moving average function

Good Morning all!   I am trying to create a script for recursive EWMA (Exponential Weighted Moving Average) volatilty estimation.   As I am not familiar with gretl syntax language I'm desparetly looking for your help. The problem is following:   1) First of all I need to identify the first observation of returns series. I've tried to do this by appliying FirstObs function. But that didn't work.   2) then I would like to replicate the ewma formula in order to get the variance of return series. for that i've seen there is a MOVAVG function. I didn't find any example of syntax in user's guide. How does this work?   I would highly appreciate your help.   Thanks a lot. Cheers