\HeaderA{log.na}{Wrapper around the log() function that avoids warnings
when negative values are presented}{log.na}
\keyword{math}{log.na}
\begin{Description}\relax
Wrapper around the log() function that avoids warnings
when negative values are presented
\end{Description}
\begin{Usage}
\begin{verbatim}
log.na(x, ...)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{x}] A numeric or complex vector.
\item[\code{...}] Further arguments that get passed on to
\code{\LinkA{log}{log}}.
\end{ldescription}
\end{Arguments}
\begin{Value}
A vector of the same length as `x' containing the transformed
values.  For x<=0, NA is returned without warning.
\end{Value}
\begin{Author}\relax
Wolfgang Huber \url{http://www.dkfz.de/abt0840/whuber}
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{log}{log}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
   log.na(-3:3)
\end{ExampleCode}
\end{Examples}

