moving averages in R [duplicate]

This question already has answers here: 开发者_C百科 Closed 11 years ago.

Possible Duplicate:

Calculating moving average in R

Is there a function to compute leading, lagging, central moving averages in R similar to matlab? I was trying to use the filter function but can't get my head around it.

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I've used the SMA function in the TTR package.