Say I used the following to normalize my data set to [1, -1]:
Public Function NormalizeData(values As Double()) As Double()
Dim min = values.Min
Dim max = values.Max
Return values.Select(Function(val) 2 * (val - min) / (max - min) - 1).ToArray
End Function
How would I go about de-normalizing a value based on that data set:
Public Function DeNormalizeData(baseData As Double(), value As Double) As Double
Dim min = baseData.Min
Dim max = baseData.Max
Return '??
End Function
Find the inverse of your function: dn=denormalized, n=normalized
n= 2*((dn-min)/(max-min)) - 1 adding 1 to both sides
n+1=2*((dn-min)/(max-min)) divide by 2
(n+1)/2=(dn-min)/(max-min) multiply by (max-min)
((max-min)*(n+1))/2 = dn - min add min to both
dn =(((max-min)*(n+1))/2)+min
You now have the function for de-normalizing, as you can see you need to save the max and min values.
public function DeNormalize(n as double, min as double, max as double) as double
return (((max-min)*(n+1))/2)+min
end function