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Why am I getting "Undefined function or variable" when I use an exponential in the function?

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Nicholas Gillam
Nicholas Gillam on 11 Apr 2019
Commented: John D'Errico on 11 Apr 2019
My code worked for other functions, but as soon as I use the exponential function, I am getting an error saying that "I" is undefined, and I honestly have no idea why it's giving me an error only for the exponential function.
a = 0;
b = 1;
N = 10;
f = @(x) exp(-x);
h=(b-a)/N;
j = 0;
x=linspace(a,b,N);
for i = 1:N-1
j=j+f((2*i+1)/2)*x;
end
answer1 = sum(I)

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Answers (1)

James Tursa
James Tursa on 11 Apr 2019
There is no "I" variable in your code. Hence the error.

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Nicholas Gillam
Nicholas Gillam on 11 Apr 2019
Interestingly enough, I definied my f for a different problem and got the error initally stated, but the new problem doesn't have an exponential in it.
f = @(x) cos(4*cos(x)+x);

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