Extract a portion of an accelerometric signal around a maximum

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Guglielmo Giambartolomei 2020-9-8

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https://ww2.mathworks.cn/matlabcentral/answers/590530-extract-a-portion-of-an-accelerometric-signal-around-a-maximum

评论： Guglielmo Giambartolomei 2020-9-18

Hello to everyone, I have an accelerometric signal (1st column : time ; 2nd column : acceleration values);

I would like to find the y_max and the corresponding x_max (I am able to do it) and starting from that precise point, extract a portion of the signal, for example 5 seconds before and 5 seconds after that point. I would like to write this new portion of the signal in a new file. This is how I started the code:

clc;
close all;
clear all;
format long
T = readtable('AT4H1X11.ASC','filetype','text','decimal',',');
T(:,3:end) = [];
Fsa=600;                %frequenza di acquisizione
Ta=1/Fsa;               % periodo di acquisizione
t_acc=T.Var1;           %estrapolazione prima colonna (tempi);
s_acc=T.Var2;           %estrapolazione seconda colonna (accelerazioni);
%N_s_acc=length(s_acc);                      % Numeno di valori 
%t_s_acc=linspace(0,N_s_acc*Ta,N_s_acc);     % Ricostruzione tempi
AT4H1X11_max_acc=max(abs(s_acc(1:end,1)))
T_arr=table2array(T);
[ymax,idy]=max(abs(T_arr(:,2)))
xmax=T_arr(idy,1)