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\name{Substitute}
\alias{Substitute}
\title{Substitutions in Language Objects}
\description{
\code{Substitute} differs from \code{\link{substitute}}
in so far as its first argument can be a variable that
contains an object of mode "language". In that case,
substitutions take place inside this object.
}
\usage{
Substitute(lang,with)
}
\arguments{
\item{lang}{any object, unevaluated expression, or
unevaluated language construct, such as a sequence
of calls inside braces
}
\item{with}{
a named list, environment, data frame or data set.
}
}
\details{
The function body is just
\code{do.call("substitute",list(lang,with))}.
}
\value{
An object of storage mode "language" or "symbol".
}
\examples{
lang <- quote(sin(x)+z)
substitute(lang,list(x=1,z=2))
Substitute(lang,list(x=1,z=2))
}
\keyword{programming}
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