MATLAB: Problem with computing an integral of a function

Question

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

Answer 1

change the fun to

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