Scale numbers into a new range

Scale a vector or matrix of numbers into a new range.

rescale(x,newrange)

Arguments

x

A numeric vector, matrix or data frame.

newrange

The minimum and maximum value of the range into which x will be scaled.

Details

rescale performs a simple linear conversion of x into the range specified by 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")