Using an integral in a for loop in matlab

Question

Stephen Bratz 2016-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/311084-using-an-integral-in-a-for-loop-in-matlab

回答： KSSV 2016-11-8

Hello, I am having trouble implementing this code.

x = linspace(2,6); y = zeros(size(x)); z = zeros(size(x)); for ii = 1:length(x) if x(ii)<=5 y(ii) = (56-(8*(x(ii)-2)))/(2*x(ii)); z(ii) = int(y(ii),2,ii); else y(ii) = (56-25-(8*(x(ii)-2)))/(2*x(ii)); z(ii) = int(y(ii),2,ii); end end plot(x,y) hold on plot(x,z)

It works great until I try to add in the z part. What I need is a value of Z corresponding to each value of y I find in the loop. It's obvious that I am using the int function wrong but I don't know how.Any help would be great!

Thanks, Stephen

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Stephen Bratz 2016-11-7

Trial.m

Here is the code file

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Answer 1

KSSV 2016-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/311084-using-an-integral-in-a-for-loop-in-matlab#answer_242410

To integrate you have to input a function with variables like x,y. In your case y(ii) is a number. There is no variable in it, it is a double class. How you want to integrate a number? I advice you to read the documentation part of int.