1\name{Substitute}
2\alias{Substitute}
3\title{Substitutions in Language Objects}
4\description{
5  \code{Substitute} differs from \code{\link{substitute}}
6  in so far as its first argument can be a variable that
7  contains an object of mode "language". In that case,
8  substitutions take place inside this object.
9}
10\usage{
11Substitute(lang,with)
12}
13\arguments{
14  \item{lang}{any object, unevaluated expression, or
15    unevaluated language construct, such as a sequence
16    of calls inside braces
17    }
18  \item{with}{
19    a named list, environment, data frame or data set.
20  }
21}
22\details{
23  The function body is just
24  \code{do.call("substitute",list(lang,with))}.
25}
26\value{
27  An object of storage mode "language" or "symbol".
28}
29\examples{
30lang <- quote(sin(x)+z)
31substitute(lang,list(x=1,z=2))
32Substitute(lang,list(x=1,z=2))
33}
34\keyword{programming}