Quad Function Error for Integrals

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Adriel Martinez-Alvarez 2017-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/334168-quad-function-error-for-integrals

评论： David Goodmanson 2017-4-7

Hello, I have spent the last 2 hours trying to figure out why the quad function (required to use instead of integral function by my professor) is not working. MatLab just tells me there is an error with my code but does not go into any specifics into what the error might be, making it very difficult & frustrating to debug. Anyways, I need to use the quad function to calculate the following integrals. The first equation y1 works, but y2 & y3 come up with an error. How do I fix this?

 y1 = quad('x.^2 +2*x+3',0 , 3)
 y2 = quad('(.5*x.^3)/(1+2*sqrt(x))', 2, 10)
 y3 = quad('.5 + ((cos(1.2*x))/((x+2)^2))', 0, 9)

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Answer 1

David Goodmanson 2017-4-7

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Hello Adriel, you are missing some dots to make element-by-element division and exponentiation happen

y1 = quad('x.^2 +2*x+3',0 , 3)
y2 = quad('(.5*x.^3)./(1+2*sqrt(x))', 2, 10)
                    ^
y3 = quad('.5 + ((cos(1.2*x))./((x+2).^2))', 0, 9)
                             ^       ^