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% Copyright (C) 1998
% Berwin A. Turlach <bturlach@stats.adelaide.edu.au>
% Bill Venables <wvenable@stats.adelaide.edu.au>
% --> ../COPYRIGHT for more details
\name{merge.formula}
\alias{merge.formula}
\title{Merge Formula With Right Hand Side of Second Formula}
\usage{
\method{merge}{formula}(x, y, \dots)
}
\arguments{
\item{x,y}{formulas.}
\item{\dots}{potentially further arguments passed to methods.}
}
\description{
This is method for formulas of the \code{\link[base]{merge}} generic
function. Here it is support for the function \code{\link{l1ce}} and
not intended to be called directly by users.
}
\examples{
merge(y ~ x1, ~ x2) ## -> y ~ x1 + x2
f2 <- merge(y ~ x1*x2, z ~ (x2+x4)^3)
f. <- merge(y ~ x1*x2, ~ (x2+x4)^3) # no LHS for 2nd term
f2
stopifnot(f2 == f.)
}
\keyword{utilities}
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