The Rescale01 function below maps/scales all items in a vector to a range from 0 to 1. (Also discussed in lecture slides).
Rescale01 <- function(x){
rng <- range(x,na.rm = TRUE)
(x-rng[1])/(rng[2] - rng[1])
}
The function doesn’t work when x contains +ve or –ve infinity (indicated in R as Inf and –Inf, respectively). For example, if x is
x <- c(-1,-5,3,5,-3,0,2,Inf,-Inf)
Rescale01(x) returns a vector containing
NaN NaN NaN NaN NaN NaN NaN NaN NaN
Rewrite the function Rescale01 so that -Inf is mapped to 0, and Inf is mapped to 1.
Hint:
Rescale01 <- function(x){
x[is.infinite(x) & (x>0)]=max(x[!is.infinite(x)])
x[is.infinite(x) & (x<0)]=min(x[!is.infinite(x)])
rng <- range(x,na.rm = TRUE)
(x-rng[1])/(rng[2] - rng[1])
}
The Rescale01 function below maps/scales all items in a vector to a range from 0 to...
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All to be done in C++ no user input is required. Just need to
create vectors and create functions to manipulate them as
described.
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