Misc Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Data Normalizing

Formula

newVal = (oldVal-min) / (max-min)

Ugly Scala Example

package com.hascode
import scala.collection.mutable.LinkedList

object NormalizerExample extends App {
    val dataSet = LinkedList(1., 6.5, 3., 6.2, 20., 31.2, 50.2, 12., 0.24, 1.224, 2.2, 3.)
    for ((num, index) <- dataSet.zipWithIndex) {
        dataSet(index) = (num - dataSet.min) / (dataSet.max - dataSet.min)
    }
    println("Normalized: " + dataSet)
}

Normalized: LinkedList(0.01521216973578863, 0.12921819759798853, 0.05947594797769014, 0.12324029048767723, 0.3982240175619966, 0.6213992163469515, 1.0, 1.0, 0.07531115879828326, 0.40498283261802576, 0.7319742489270387, 1.0)

Datanormalization on Micha Kops' Tech Notes

Misc Snippets

Data Normalizing