[R] Extract lags from a formula

From: Kerpel, John <John.Kerpel_at_infores.com>
Date: Fri, 02 May 2008 13:35:41 -0500


Hi folks!  

How do I extract lags from a formula? An example:  

mod.eq<-formula(x~lag(x,-1)+lag(x,-2))

> mod.eq

x ~ lag(x, -1) + lag(x, -2)

> mod.eq[1]

"~"()

> mod.eq[2]

x()

> mod.eq[3]

lag(x, -1) + lag(x, -2)()  

I'm trying to extract the lags into a vector that would be simply [1,2]. How do I do this? I'm using the dyn package to do dynamic regression.  

John

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