Problem with computing an integral of a function

Question

Dimitris M 2013-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/65191-problem-with-computing-an-integral-of-a-function

评论： Masoud Aghajani 2020-8-4

采纳的回答： Babak

在 MATLAB Online 中打开

Hello

I have problem computing the integral of a function:

The function is the following

fun = @(t) sin(2*pi*t*697)*(sin(2*pi*t*941)+sin(2*pi*t*1477))

Is strange cause when I compute eg. fun(2) everything seems to work, then when I am trying to compute the integral (see below I getting an error)

integral(fun,0,4)

Can someone please inform me on my mistake ?

Regards

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Dimitris M 2013-2-27

在 MATLAB Online 中打开

The error is the following:

Error using  * 
Inner matrix dimensions must agree.
Error in @(t)sin(2*pi*t*697)*(sin(2*pi*t*941)+sin(2*pi*t*1477))
Error in integralCalc/iterateScalarValued (line 314)
                fx = FUN(t);
Error in integralCalc/vadapt (line 133)
            [q,errbnd] = iterateScalarValued(u,tinterval,pathlen);
Error in integralCalc (line 76)
        [q,errbnd] = vadapt(@AtoBInvTransform,interval);
Error in integral (line 89)
Q = integralCalc(fun,a,b,opstruct);