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\name{rescale}
\title{Scale numbers into a new range}
\description{Scale a vector or matrix of numbers into a new range.}
\usage{
rescale(x,newrange)
}
\alias{rescale}
\arguments{
\item{x}{A numeric vector, matrix or data frame.}
\item{newrange}{The minimum and maximum value of the range into which
\samp{x} will be scaled.}
}
\details{
\samp{rescale} performs a simple linear conversion of \samp{x} into the
range specified by \samp{newrange}. Only numeric vectors, matrices or data
frames with some variation will be accepted. NAs are now preserved -
formerly the function would fail.
}
\value{On success, the rescaled object, otherwise the original object.}
\author{Jim Lemon}
\examples{
# scale one vector into the range of another
normal.counts<-rnorm(100)
normal.tab<-tabulate(cut(normal.counts,breaks=seq(-3,3,by=1)))
normal.density<-rescale(dnorm(seq(-3,3,length=100)),range(normal.tab))
# now plot them
plot(c(-2.5,-1.5,-0.5,0.5,1.5,2.5),normal.tab,xlab="X values",
type="h",col="green")
lines(seq(-3,3,length=100),normal.density,col="blue")
}
\keyword{misc}
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