[R] mean of a value of the last 2 hours

[Tagmarie]

Hello, 
I have a data frame somewhat like that: 

myframe <- data.frame (ID=c("Ernie", "Ernie", "Ernie", "Bert", "Bert",
"Bert"), Timestamp=c("24.09.2012 09:00", "24.09.2012 10:00", "24.09.2012
11:00"), Hunger=c(1,1,1,2,2,1) )
myframestime <- as.POSIXct (strptime(as.character(myframe$Timestamp),
"%d.%m.%Y %H:%M"), tz="GMT")
myframe2 <- cbind (myframe,myframestime)
myframe2$Timestamp <- NULL  
myframe2

I want to add an additional column at the right and get in each row a value
which shows the mean of "hunger" of the last two hours. 

Does anyone know how that works? That would be very helpful. 



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