I am trying to translate a find_peaks function call in python to matlab and they use a max threshold

Hi,

I am using matlab to recreate a script done in python. They use the python function find_peaks, which is very similar as the Matlab function.

One major difference is that when using the threshold specification, Matlab only has a minimum threshold option, whilst in python it is also possible to insert a max threshold.

Does anybody know how to implement using a max threshold in findpeaks in matlab?

Python example: find_peaks(sig, distance=distance, threshold=(None, 5.0), prominence=(20, None))

Thanks a lot in advance!!

Answer 1

[Star Strider]

There is no 'MaxPeakHeight' so impose the maximum condition after the findpeaks call to limit the maximum peak values considered.

t = linspace(0, 10);
sig = sum(sin((1:2:9)'*2*pi*t));

[pks1,locs1] = findpeaks(sig);

figure
plot(t, sig)
hold on
plot(t(locs1), pks1, '^r')
hold off
grid
title('Plot All Peaks')

Lv = (pks1 <= 3);                                                   % Logical Vector To Keep Peaks <= 3

figure
plot(t, sig)
hold on
plot(t(locs1(Lv)), pks1(Lv), '^r')
hold off
grid
title('Plot Only Peaks <= 3')

There may be other ways to do this. I chose the ‘logical vector’ approach.

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[Mette Dittmann]

Thanks a lot! that makes great sense!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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