Hi Josh,
Try something like this
I'm assuming that you already have the magnitude, sart and stopfrequencies from the analyzer
'set a reference to the NationalInstruments.Analysis.(pro or enterprise) library
'in the property pages of your project
'then add this line to your form
Imports NationalInstruments.Analysis.Math
Public Class Form1 'add a button and scatterplot to your form
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim magnitude(500) As Double
Dim frequency(500) As Double
Dim bandwidth, startfrequency, stopfrequency As Double
Dim maxvalue As Double = 0 Dim maxvaluefreq As Double = 0
Dim imaxvalue As Long = 0 Dim j As Long = 0
'get magnitude data, start and stop frequncy from signal analyzer
'with gpib or serial calls....
'for this load random dummy magnitude data
For j = 0 To 500 magnitude(j) = Rnd()
Next
startfrequency = 1000000000.0
stopfrequency = 2000000000.0
'calc bandwith
bandwidth = (stopfrequency - startfrequency) / 500
'load frequency data
frequency(0) = startfrequency
For j = 1 To 500 frequency(j) = frequency(j - 1) + bandwidth
Next
'ArrayOperation functions are part of the NI Analysis Library
maxvalue = ArrayOperation.GetMax(magnitude)
imaxvalue = ArrayOperation.GetIndexOfMax(magnitude)
maxvaluefreq = frequency(imaxvalue)
Debug.WriteLine("Max Value = " & maxvalue & " at " & maxvaluefreq & " Hz")
'use scatterplot1 to display data
ScatterPlot1.PlotXY(frequency, magnitude)
End Sub
End Class
Hope this helps
Curt
