How can I obtain average waveform of multiple waveforms

[ATX1122]

Hello, 

I am relatively new to LabVIEW and working on a project where I need to average multiple waveforms and get the average waveform and display it. 

I have attached a screenshot of a part of the VI since the whole VI is too large and cannot run without hardware. 

Could someone help me to solve this issue? I tried using a shift register, to get sum of waveforms and dividing by the number of waveforms to get an average waveform. But when I am having trouble initializing waveform at the left shift register. Because dt is set to 1 if I add a constant. But my dt is calculating based on the settings selected by the user so I cant have a constant there. This gives me mismatching waveforms when tried to add them. 

I hope you understand what i am trying to say.  Any idea what i can do to solve this? 

[GerdW · Accepted solution]

Hi ATX,

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@ATX1122 wrote:
I tried using a shift register, to get sum of waveforms and dividing by the number of waveforms to get an average waveform. But when I am having trouble initializing waveform at the left shift register. Because dt is set to 1 if I add a constant.

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Two options:

1. When you know the samplerate before entering the loop then you can define the needed waveform constant with a proper dt…
2. Don't initialize before the loop, but in the 1st iteration! IF first iteration THEN "use current waveform" ELSE "add previous to current waveform"…

[ATX1122]

Hi GerdW, 

Yes, the second method worked. Thank you so much !!