\HeaderA{simchirp}{Compute and return simulated chirp function.}{simchirp}
\keyword{manip}{simchirp}
\begin{Description}\relax
This function computes and returns the coordinates of the reflected simulated chirp function described in Nason and Silverman, 1995. This function is a useful test function for evaluating wavelet shrinkage and time-scale analysis methodology as its frequency changes over time.
\end{Description}
\begin{Usage}
\begin{verbatim}
simchirp(n=1024)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{n}] The number of ordinates from which to sample the chirp signal.
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
This function computes and returns the x and y coordinates of the reflected chirp function described in Nason and Silverman, 1995. 

The formula for the reflected simulated chirp is  *formula*

The chirp returned is a discrete sample on \code{n} equally spaced points between -1 and 1.
\end{Details}
\begin{Value}
A list with two components: 

\begin{ldescription}
\item[\code{x}] a vector of length \code{n} containing the ordered x ordinates of the chirp from -1 to 1.
\item[\code{y}] a vector of length \code{n} containing the corresponding y ordinates of the chirp.
\end{ldescription}
\end{Value}
\begin{Section}{RELEASE}
Version 3.5.3 Copyright Guy Nason 1994
\end{Section}
\begin{Examples}
\begin{ExampleCode}
#
# Generate the chirp
#
#test.data <- simchirp()$y
#ts.plot(test.data)
\end{ExampleCode}
\end{Examples}

