Swift data normalisation

NormaliseData.swift

import Foundation

/// Normalise a value to a 0...1 range.
func normalise(value: Double, lower: Double, upper: Double) -> Double {
    return max(0.0, min(1.0, (value - lower) / (upper - lower)))
}

normalise(value: 0, lower: 0, upper: 2) // -> 0
normalise(value: 1, lower: 0, upper: 2) // -> 0.5
normalise(value: 22, lower: 0, upper: 50) // -> 0.44
normalise(value: 48, lower: 0, upper: 50) // -> 0.96