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Problem with a program concerning composite trapezoid rule

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Drake
Drake 2013-10-22
关闭： MATLAB Answer Bot 2021-8-20
In this program I'm using the composite trapezoid rule on the function in my program. I've used the same program with different functions and haven't had issues till I tried it with this function. (Not sure if I'm using the dots correctly in my function) It says I have an error with line S=f(a); Here is code:
f = @(x) -exp(-(ln(t).^2))*(1./t);
a = 1;
b = 0;
n= 10000;
format long
h = (b-a)/n;
S = f(a);
i=1:1:n-1;
x=a+h*i;
y=f(x);
S=S+2*sum(y);
S=S+f(b);
F=h*S/2

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