\section{IFFTSHIFT Inverse Shift FFT Output}

\subsection{Usage}

The \verb|ifftshift| function shifts the DC component (zero-frequency)
of the output from the center of the array back to the first position
and iseffectively the inverse of \verb|fftshift|.  For vectors
this means swapping the two halves of the vector.  For matrices,
the first and third quadrants are swapped.  So on for N-dimensional
arrays.  The syntax for its use is
\begin{verbatim}
     y = ifftshift(x).
\end{verbatim}
Alternately, you can specify that only one dimension be shifted
\begin{verbatim}
     y = ifftshift(x,dim).
\end{verbatim}
