\HeaderA{nullevels.wst}{Sets whole resolution levels of coefficients equal to zero in a wst object.}{nullevels.wst}
\keyword{manip}{nullevels.wst}
\begin{Description}\relax
Sets whole resolution levels of coefficients equal to zero in a \code{\LinkA{wd}{wd}} object.
\end{Description}
\begin{Usage}
\begin{verbatim}
nullevels.wst(wst, levelstonull, ...)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{wst}] An object of class \code{\LinkA{wst}{wst}}.
\item[\code{levelstonull}] An integer vector specifying which resolution levels of coefficients of \code{\LinkA{wst}{wst}} that you wish to set to zero. 
\item[\code{...}] any other arguments
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
Setting whole resolution levels of coefficients to zero can be very useful. For example, one can construct a linear smoothing method by setting all coefficients above a particular resolution (the \emph{primary resolution} equal to zero. Also setting particular levels equal to zero can also be useful for removing noise which is specific to a particular resolution level (as long as important signal is not also contained at that level). 

To remove individual coefficients on a systematic basis you probably want to look at the \code{\LinkA{threshold}{threshold}} function.
\end{Details}
\begin{Value}
An object of class \code{\LinkA{wst}{wst}} where the coefficients in resolution levels specified by \code{levelstonull} have been set to zero.
\end{Value}
\begin{Section}{RELEASE}
Version 3.8.1 Copyright Guy Nason 1997
\end{Section}
\begin{SeeAlso}\relax
\code{\LinkA{nullevels}{nullevels}}, \code{\LinkA{wst}{wst}}, \code{\LinkA{wst.object}{wst.object}}, \code{\LinkA{threshold}{threshold}}.
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
#
# Look at the example for this-is-escaped-code{
# The operation is almost identical except that this-is-escaped-codenormal-bracket41bracket-normal
# objects are replaced by this-is-escaped-codenormal-bracket43bracket-normal ones. 
\end{ExampleCode}
\end{Examples}

