Filter amplitude vs time data
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ignacio bobadilla tapia
am 2 Jun. 2021
Kommentiert: ignacio bobadilla tapia
am 2 Jun. 2021
Dear,
Along with saying hello, I wanted to ask for your help please. I need to identify the wave with the greatest amplitude (maximum peak), and intersect it with a threshold value, in this case of 1.5, and identify the points of intersection, that is, the nodes where the curve of the maximum peak intersects with the threshold value, to to be able to identify node 1 and node 2 with respect to the horizontal axis (time series), for which I attach the data, and an image of the problem. Best regards.
close all, clear all, clc
data=load('D:\HP CIVIL\serie de tiempo\data.txt');
t=0:10:4*3600;
plot(t,data)
xlabel('Time (s)'); ylabel('Amplitude (m)')
hold on
plot(t,1.5,'r')
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KSSV
am 2 Jun. 2021
data=load('data.txt');
t=(0:10:4*3600)';
[val,idx] = max(data) ;
ti = (0:0.05:4*3600)' ;
datai = interp1(t,data,ti) ;
id1 = abs(datai-1.5)<=0.001 ;
ti_th = ti(id1) ;
datai_th = datai(id1) ;
id2 = knnsearch([ti_th datai_th],[t(idx) data(idx)],'k',2) ;
plot(t,data)
xlabel('Time (s)'); ylabel('Amplitude (m)')
hold on
plot(ti_th,datai_th,'.r')
plot(ti_th(id2),datai_th(id2),'Ok')
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