Problem with computing an integral of a function

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

[Azzi Abdelmalek]

Which error?

[Dimitris M]

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);

[Isaac]

fun = @(t)sin(2*pi*t*697).*(sin(2*pi*t*941)+sin(2*pi*t*1477)), integral(fun,0,4)

Answer 1

[Babak]

change the fun to

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

[Masoud Aghajani]

This helped me 7 years later.