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\name{RMqexp}
\alias{RMqexp}
\title{Variant of the exponential model}
\description{
The covariance function is
\deqn{C(x)= ( 2 e^{-x} - \alpha e^{-2x} ) / ( 2 - \alpha )}
}
\usage{
RMqexp(alpha, var, scale, Aniso, proj)
}
\arguments{
\item{alpha}{value in \eqn{[0,1]}}
\item{var,scale,Aniso,proj}{optional arguments; same meaning for any
\command{\link{RMmodel}}. If not passed, the above
covariance function remains unmodified.}
}
\value{
\command{\link{RMqexp}} returns an object of class \code{\link[=RMmodel-class]{RMmodel}}.
}
\references{
\itemize{
\item ?
}
}
\me
\seealso{
\command{\link{RMmodel}}.
}
\keyword{spatial}
\keyword{models}
\examples{\dontshow{StartExample()}
RFoptions(seed=0) ## *ANY* simulation will have the random seed 0; set
## RFoptions(seed=NA) to make them all random again
model <- RMqexp(alpha=0.95, scale=0.2)
x <- seq(0, 10, 0.02)
plot(model)
plot(RFsimulate(model, x=x))
\dontshow{FinalizeExample()}}
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