PEAK-System Forum

Hello,

I am wondering how or if it is possible to calculate, for example the derivative of an signal, which was recorded via the Peak-CAN Tracer and was imported to a plot file?
Could you kindly provide some sample code.

Thanks in advance

Hi,

this will be more or less a mathematical problem, do you have the mathematical skills to build the derivative of a signal based on trace files? For me, this will be some days study and work

. Perhaps there are some more mathematical genius out there, which could solve that problem.

regards

Michael

Hallo,

It is not the mathematical skills that are difficult to me in this matter, it is more how can I handle data from the tracer which are present as a recorded .trc file and do the math to it? Could i do this operation by a Macro?

Thanks in Advance.

Hi,

yes you can do that with a Macro. Suppose you have a recorded signal with the name 'Speed' that you would like to use for further calculations. If you have already imported the trace into a Plotter, the code would look like this:

Code: Select all

Sub PlotToSpeed()
    Dim doc, plotter, channel, i, speed
    ' Open the plotter file
    Set doc = Documents.Open("MyPlot.plt")
    ' Obtain a reference to the Plotter object
    Set plotter = doc.ActiveWindow.Object
    ' Suppose the desired signal is assigned to channel 1
    Set channel = plotter.Channels(1)
    ' Iterate through all data points and access the speed values
    For i = 0 To channel.DataCount-1
        speed = channel.DataY(i)
        PrintToOutputWindow speed  ' Or any other processing
    Next
End Sub

You can also extract the speed values directly from the tracer:

Code: Select all

Sub TraceToSpeed()
    Dim doc, trc, sym, SpeedVar, msgs, msg, speed
    ' Open the trace file
    Set doc = Documents.Open("MyTrace.trc")
    ' Obtain a reference to the Tracer object 
    Set trc = doc.ActiveWindow.Object.Tracer
    ' Get the Symbol object that contains the speed CAN variable
    ' to filter the Tracer contents
    Set sym = SymbolsManager("MySymbols").Item("MySymbol")
    ' Now filter the Tracer contents using the Symbol object
    Set msgs = trc.Messages.FindSymbol(sym)
    ' Get the Variable object that contains the neccessary information to
    ' extract the speed values from the CAN message data bytes 
    Set SpeedVar = Signals("Speed").Source
    ' Iterate through all found messages and extract the speed values
    For Each msg in msgs
        speed = SpeedVar.MessageToValue(msg)
        PrintToOutputWindow speed    ' Or any other processing
    Next
End Sub

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