How to find troughs of a signal below a threshold
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I am trying to find troughs of a signal which are below a certain threshold
I tried findpeaks but its not working
findpeaks(-1*TrialLFP{1,iSession}(chan,:),'Threshold',sigma);
Is there any thresholding option for islocalmin function?
1 comentario
Jan
el 6 de Mzo. de 2023
What are "throughs of a signal"? What does "is not working" mean explicitly?
Respuestas (1)
Star Strider
el 6 de Mzo. de 2023
Use the 'MinPeakHeight' name-value pair —
t = linspace(0, 2*pi, 500);
s = sin(2*pi*t) - sin(2*pi*0.1*t-0.45);
Threshold = -1.75;
[pks,locs] = findpeaks(-s, 'MinPeakHeight',-Threshold)
figure
plot(t, s)
hold on
plot(t(locs), s(locs), 'vr', 'MarkerFaceColor','r')
hold off
grid
ylim([-2.5 1.5])
yline(Threshold, '--m', 'Threshold')
.
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