\HeaderA{valid.just}{Validate a Justification}{valid.just}
\keyword{dplot}{valid.just}
\begin{Description}\relax
This utility function is useful for determining
whether a justification specification is valid.
An error is given if the justification is not valid.
\end{Description}
\begin{Usage}
\begin{verbatim}
valid.just(just)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{just}] A justification either as a character value,
e.g., \code{"left"}, or as a numeric value, e.g., 0.
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
This function is useful within a \code{validDetails} method
when writing a new grob class.
\end{Details}
\begin{Value}
A numeric representation of the justification (e.g.,
\code{"left"} becomes 0, \code{"right"} becomes 1, etc, ...).
\end{Value}
\begin{Author}\relax
Paul Murrell
\end{Author}

