Kenny Barker - 6 months ago 40

Vb.net Question

I am currently using the following code to normalize data:

`Public Function NormalizeData(values As Double()) As Double()`

Dim min = values.Min

Dim max = values.Max

Dim outList(values.Count - 1) As Double

For i = 0 To values.Count - 1

outList(i) = (values(i) - min) / (max - min)

Next

Return outList

End Function

This returns values from 0 to 1 accordingly. I am confused on how to make this normalize between [1, -1] instead of [1, 0].

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Answer Source

You already know how to normalise to a range of 0 to 1. If you want the range to be -1 to 1, you just need to multiply the normalised data by 2 and subtract 1.

As I said in my comment, you could just modify the statement inside your For loop to adjust the data:

```
outList(i) = 2 * (values(i) - min) / (max - min) - 1
```

However, rather than use a loop to build the second array, I would make the code more compact by using the `Select`

method to return a new array with modified values. The whole function would then be:

```
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
```