

    \filetitle{fft}{Discrete Fourier transform of tseries object}{tseries/fft}

	\paragraph{Syntax}
 
 \begin{verbatim}
 [y,range,freq,per] = fft(x)
 [y,range,freq,per] = fft(x,range,...)
 \end{verbatim}
 \paragraph{Input arguments}
 
 \begin{itemize}
 \item
   \texttt{x} {[} tseries {]} - Input tseries object that will be
   transformed.
 \item
   \texttt{range} {[} numeric \textbar{} Inf {]} - Date range.
 \end{itemize}
 \paragraph{Output arguments}
 
 \begin{itemize}
 \item
   \texttt{y} {[} numeric {]} - Fourier transform with data organised in
   columns.
 \item
   \texttt{range} {[} numeric {]} - Actually used date range.
 \item
   \texttt{freq} {[} numeric {]} - Frequencies corresponding to FFT
   vector elements.
 \item
   \texttt{per} {[} numeric {]} - Periodicities corresponding to FFT
   vector elements.
 \end{itemize}
 \paragraph{Options}
 
 \begin{itemize}
 \item
   \texttt{'full='} {[} \texttt{true} \textbar{} \emph{\texttt{false}}
   {]} - Return Fourier transform on the whole interval {[}0,2*pi{]}; if
   false only the interval {[}0,pi{]} is returned.
 \end{itemize}
 \paragraph{Description}
 
 \paragraph{Example}
 
 \}


