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\name{RMsign}
\alias{RMsign}
\alias{RRsign}
\title{Random sign}
\description{
\command{RMsign} defines a random sign. It can be used as part of the
model definition of a Poisson field.
}
\usage{
RMsign(phi, p)
}
\arguments{
\item{phi}{shape function of class \code{\link[=RMmodel-class]{RMmodel}}}
\item{p}{probability of keeping the sign}
}
\details{
\command{RMsign} changes the sign of the shape function \code{phi}
with probability \code{1-p} and keeps it otherwise.
}
\value{
\command{\link{RMsign}} returns an object of class \code{\link[=RMmodel-class]{RMmodel}}.
}
\note{
Random univariate or multivariate objects usually start with \code{RR}, not with \code{RM}.
This is an exception here, as it operates on shape functions.
}
\me
\seealso{
\command{\link{RMmodel}},
\link{RR}.
}
\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 <- RPpoisson(RMsign(RMtent(), p=0.8))
x <- seq(0, 10, 0.02)
plot(RFsimulate(model, x=x))
\dontshow{FinalizeExample()}}
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