Incorrect Integrator Behaviour Simulink

Consider the following simple block diagram:

I get the following output on the scope:

What is going on here? If the integrated function was shifted by some constant of integration C, that would be understandable. But why the change in amplitude?

Answer 1

[Paul]

It looks like the input sine wave is

sin(2*pi/2*t) = sin(pi*t)

The output of the integrator should be

-1/pi*cos(pi*t) + C

Because the IC on the integrator is zero, C is then

-1/pi + C = 0 -> C = 1/pi.

So the integrator output should be

-1/pi*cos(pi*t) + 1/pi

which looks like result in the scope.

[Muhammad Abdur Rahman]

Oh no! I made a mathematical oopsie. 😳