[R] how do I do the autocovariance of a moving average?

[Rampagegrl]

Hi guys,  

I'm trying to do the autocovariance of a moving average but it's giving me
errors.  Here is my code:

> w=rnorm(500,0,1)
> v=filter(w, sides=2, rep(1/3,3))
> acf(w, lag.max=20)  <=that printed out a nice graph.
> acf(v, lag.max=20)
Error in na.fail.default(as.ts(x)) : missing values in object

thanks a lot.

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