\HeaderA{filtfft}{Apply an convolution filter using an FFT}{filtfft}
\keyword{math}{filtfft}
\keyword{internal}{filtfft}
\begin{Description}\relax
Expands a vector to the length of the filter and then convolutes
it using two successive FFTs.
\end{Description}
\begin{Usage}
\begin{verbatim}
filtfft(y, filt)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{y}] numeric vector of data to be filtered
\item[\code{filt}] filter with length \code{nextn(length(y))}
\end{ldescription}
\end{Arguments}
\begin{Value}
A numeric vector the same length as y.
\end{Value}
\begin{Author}\relax
Colin A. Smith, \email{csmith@scripps.edu}
\end{Author}

