R help - Sep 2011 - Poly-phase Filters in R

Hello List,

I am trying to do the following:
1. Use a BandPassFilter h[n] on a series x[n]
2. Then Decimate the series by a factor D such that y[k]=x[k*D]

The decimation factor is considerable (10,000) so that filtering before the
decimation, using convolve(), seems foolish.
Can you think of an R implementation for a polyphase filter, that uses the
fact that most samples will be thrown away...?
Is there a package for it?

Thanks,
Eran.
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