total number of peaks in a signal

[SAIbme]

Hi Henrik_Volkers, 

Thanks for your instant reply and by the by, that's not my homework. I've been working on this for more than a month trying my own solutions.

I thought I can get the total number of peaks without using any formulas (MATLAB script), but I have a problem in solving it. 

So please excuse me if there is any trouble. 

[SAIbme]

I have attached a VI and an acquired signal.

If the value of N=13, then I get No. of peks is 72, increasing N gives higher value of peaks.

Kindly let me know how to adjust the value of "N" for "FOR LOOP" in order to get the number of peaks.

 Thanks in advance.

Good Day

[alexderjuengere]

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@SAIbme wrote:

Hi @1984,

Thanks for your reply.

Kindly be more specific about implementing the equation which you have suggested " speaking x(i) is a peak IF (x(i-1)<x(i)) AND (x(i+1)=<x(i))" .

Can it be implemented using MATLAB script?

Please suggest me an idea for it.

Good Day  

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Hi SAIbme,

looks like (discrete) calculus to me:

if the first derivate f'(x) of your input signal f(x) changes it's signum as described by 1984, this change indicates a peak.

In the following example the peak would be indicated at x = 25

see also: https://forums.ni.com/t5/LabVIEW/Detecting-peaks-in-blood-pressure-waveform/m-p/2419090#M746711

Alex

[SAIbme]

Hi friends,

I would like to thank 1984, NapDynamite, Henrik_Volkers, alexderjuengere

For their replies and suggestions.

Finally, I've got the correct output.

Thank you friends once again.

Good Day