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

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Nicholas Gillam
Nicholas Gillam 2019-4-11
评论： John D'Errico 2019-4-11
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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回答（1 个）

James Tursa
James Tursa 2019-4-11
There is no "I" variable in your code. Hence the error.
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