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How can I find out the solution of second derivative pick detection. I have already done 1st derivative pick detection now I want use the same method for 2nd derivatives..

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Md. Najmul Mowla
Md. Najmul Mowla on 26 Dec 2019
My first derivative Pick detection code is given bellow:
clear;
clc;
t=-5:1/20:5;
ind1=zeros(1,length(t));
x=sin(2*pi*t)+cos(3*pi*t);
% x=sin(2*pi*t);
g=diff(x);
ind = find(g(1:end-1).*g(2:end) < 0)+1;
plot(t,x, t(ind), x(ind), 'o');
Now, I want to write second derivative pick direction by using above code.
The second derivative equation is
Y1(n) = [x(n)-2x(n-2)+x(n-4)]
Please, help me to write the code for Second derivative

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