Averaging array contents

[Mer]

Hi altenbach,

thankyou for clearing my silly doubt .. i knew i had missed somethin

best regards

mer

[TWGomez]

Mean.vi from Mathematics->Probability and Statistics pallete works on waveforms as well, you can adapt to use it rather than manually dividing.

[altenbach]

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TWGomez wrote:
Mean.vi from Mathematics->Probability and Statistics pallete works on waveforms as well, you can adapt to use it rather than manually dividing.

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Not quite the same here.

Mean takes the average of all points in a single waveform to procude a single number.

Here we want to average several waveforms to produce a waveform that is the average of all the original ones. 🙂

[TWGomez]

I was illustrating that you can use the mean function in place of all you division stuff...not providing a replacement example...

just use the mean with the waveform created in each loop and autoindex the value out to create a new waveform with the averaged values.

See attached.

Or instead of averaging in the loop do it outside the loop with another For loop, like your example.

[GerdW]

Hi Gomez,

nope...

We don't want to have means of each waveform - we want to average all the waveform...

To picturize this: think of a 2D array - you calc the mean of each column, we calc the average of each row...

[Mer]

Hi  ,

i had another difficulty regarding this ...

actually each waveform entering this ' waveform averaging' VI  is actually an EEG reponse to each sound click we present to the subject.

so i need each click to trigger or start the recording. Also this recording should stop before the next click.

Thus if i give 1000 clicks, the averaging VI must produce the average of the 1000 waveforms.

the clicks are given as a square waveform , frequency = 10.1 Hz ,  TIMING mode: simulate acquisition timing , samples per second =  44000 , no : of samples = 204000 (or a figure as high)

i used the simulate signal  and play waveform blocks.

for the above problem, i tried to use the trigger and gate block... i thought of connecting the simulate waveform block to the waveform averaging vi using the trigger block...but dont seem to reach anything useful ...

thankyou

best regards

Mer