Find more than one peak in a waform

[Lahcen27]

Hi every body,

Could you please help how I can find the location of the tree most great values (the 3 peaks) of a time serie (waveform) ? thank you 🙂

Best regards

Lahcen

[GerdW]

Hi Lahcen,

the WaveformPeakDetection delivers more than one peak!

So where do you have problems with?

Can you attach a VI with typical data to describe your problem?

[Lahcen27]

Hi GerdW,

Thak you for replying.

My problem is that I don't want to specify any threshold. The WaveformPeakDetection vi requires a threshold as input parameter (0 by default). 

[perhult]

No, it does not require that you wire threshold.

If your peaks all might be below zero, just wire neg inf or some other suitable constant to the threshold.

[Lahcen27]

Hi Perhut,

Yes it's not required in therms of "This Connection is required". But we should specify a value of threshold. So that the VI can do the calculation and find all peaks that are above the threshold and have a width > WIDTH. So thay are relative to the threshold. 

What I want is to find the location of exacly the 3 peaks without specify any threshold.

[GerdW · Accepted solution]

Hi Lahcen,

set a (very) low threshold. Then you should get a list of peaks.

Sort this list by peak height and use only the 3 most high peaks…

[Lahcen27]

Good Idea. thank you GerdW 🙂