Borrar filtros
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Find the second signal points (x, y location) exactly the same place of the first signal peak (x, y) matlab

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Hi all, I have two signals where I find the negative peak of one signal and need to find the corresponding x,y points for the other signal. I was thinking of drawing a "vertical line" where the first signal peak is detected and then take the intersection point of the second signal. I think there are better straight forward methods to achieve this. In my example (please refer to the figure) x,y values are 413 and -6.18. I need to find the "y" value for the other signal (red signal) in the same location.
For your reference, I have attached the sample plot and the signal.
Kind regards

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Mathieu NOE
Mathieu NOE el 27 de Abr. de 2021
hope this helps you see function attached
x = Value(:,1);
y = Value(:,2);
t = 1:length(x);
threshold = min(y); %
[t0_pos,s0_pos,t0_neg,s0_neg]= crossing_V7(x,t,threshold,'linear'); % positive (pos) and negative (neg) slope crossing points
% ind => time index (samples)
% t0 => corresponding time (x) values
% s0 => corresponding function (y) values , obviously they must be equal to "threshold"
plot(t,x,t,y,t0_pos,s0_pos,'+r',t0_neg,s0_neg,'+g','linewidth',2,'markersize',12);grid on
legend('signal x','signal y','positive slope crossing points','negative slope crossing points');
% the point we are looking for is the last 'positive slope crossing points'
xx = t0_pos(end)
yy = threshold
  9 comentarios
Ganesh Naik
Ganesh Naik el 27 de Abr. de 2021
Hi Mathieu, thank you so much for your help with finding the corresponding values and displaying them on the plot. I appreciate your help with filtering signals, I will go through it in detail. Thanks again and kind regards!!!

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