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\name{interpret.gam}
\alias{interpret.gam}
%- Also NEED an `\alias' for EACH other topic documented here.
\title{Interpret a GAM formula}
\description{ This is an internal function of package \code{mgcv}. It is a service routine for
\code{gam} which splits off the strictly parametric part of the model formula, returning
it as a formula, and interprets the smooth parts of the model formula.
Not normally called directly.
}
\usage{interpret.gam(gf, extra.special = NULL)}
\arguments{\item{gf}{A GAM formula as supplied to \code{\link{gam}} or \code{\link{gamm}}, or a
list of such formulae, as supplied for some \code{\link{gam}} families.}
\item{extra.special}{Name of any extra special in formula in addition to \code{s}, \code{te}, \code{ti} and \code{t2}.}
}
\value{An object of class \code{split.gam.formula} with the following items:
\item{pf}{A model formula for the strictly parametric part of the model.}
\item{pfok}{TRUE if there is a \code{pf} formula.}
\item{smooth.spec}{A list of class \code{xx.smooth.spec} objects where \code{xx} depends on the basis
specified for the term. (These can be passed to smooth constructor method functions to actually set up
penalties and bases.)}
\item{full.formula}{An expanded version of the model formula in which the options are fully expanded, and
the options do not depend on variables which might not be available later.}
\item{fake.formula}{A formula suitable for use in evaluating a model frame.}
\item{response}{Name of the response variable.}
}
\author{ Simon N. Wood \email{simon.wood@r-project.org}}
\seealso{ \code{\link{gam}} \code{\link{gamm}}}
\keyword{models} \keyword{smooth} \keyword{regression}%-- one or more ..
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