How to create formula with lookup table

Question

Hi, I would like to convert formula in the below to labview format, any idea how this could be done easiest way?
I'm planning to use formula node but I'm not not sure about how to use lookup table inside the formula or is it even possible?
br, Jani
        Dim dblLookUp(,) As Double = New Double(3, 1) {{4, 4}, {10, 200}, {60, 3000}, {100, 7000}}
        If dblAbsValue >= 0 And dblAbsValue <= dblLookUp(0, 0) Then
            dblk = dblLookUp(0, 1) / dblLookUp(0, 0)
            dblValue = dblAbsValue * dblk
            'lblMode.Text = 1
        ElseIf dblAbsValue > dblLookUp(0, 0) And dblAbsValue <= dblLookUp(1, 0) Then
            dblk = (dblLookUp(1, 1) - dblLookUp(0, 1)) / (dblLookUp(1, 0) - dblLookUp(0, 0))
            dblValue = dblk * dblAbsValue - dblk * dblLookUp(0, 0) + dblLookUp(0, 1)
            'lblMode.Text = 2
        ElseIf dblAbsValue > dblLookUp(1, 0) And dblAbsValue <= dblLookUp(2, 0) Then
            dblk = (dblLookUp(2, 1) - dblLookUp(1, 1)) / (dblLookUp(2, 0) - dblLookUp(1, 0))
            dblValue = dblk * dblAbsValue - dblk * dblLookUp(1, 0) + dblLookUp(1, 1)
            'lblMode.Text = 3
        ElseIf dblAbsValue > dblLookUp(2, 0) And dblAbsValue <= dblLookUp(3, 0) Then
            dblk = (dblLookUp(3, 1) - dblLookUp(2, 1)) / (dblLookUp(3, 0) - dblLookUp(2, 0))
            dblValue = dblk * dblAbsValue - dblk * dblLookUp(2, 0) + dblLookUp(2, 1)
            'lblMode.Text = 4
        Else
            dblValue = dblLookUp(3, 1) '* Math.Sign(dblValue)
            'lblMode.Text = 5
        End If
        Return dblValue * intSign
Solved!
Go to Solution.

Answer 1

Hello janijt,
You can definitely use formula node for it. What you would do is to create a constant array for the lookup table. 
Here's an implementation in MathScript Node
Andy Chang
National Instruments
LabVIEW Control Design and Simulation