3d surface graph with history

[elen405]

I am trying to implement a 3d surface graph of an incoming signal plotting the amplitude vs. frequency and time.  I can easily have it display amplitude vs. frequency, but it is only for the current input. I would like to add a sort of "history" that shows what has happened maybe the last 5 seconds.  I am guessing I need to use some kind of a buffer, but the 3d surface graph inputs are a bit tricky.  Thanks for any tips.

[mikeporter]

check this out. I modified an example that came with LV to show one possibility...

Mike...

[elen405]

Perfect, exactly what I was looking for.  Thanks so much.

[elen405]

This is a good example of how to show the history, however I guess I dont see exactly how to modify this so that the graph shows the amplitude on the z axis, frequency domain on the y, and time on the x.  It seems that the way this is set up the y axis is a function of that inner for loop.  Any tips would be greatly appreciated.

[mikeporter]

Will in s sense, it's doing that already. Z is clearly the amplitude of the sine waves. If the sine waves were freq. analysis results, Y would be the frequency and X is time, or the stack of time samples going from front to back.

Replace the VI for generating the sine wave with your analysis routine output.

Mike...