Heaviside function in simulink

How to generate this function in Simulink (Matlab code):

20.*t.*heaviside(t) - 40.*(t-10).*heaviside(t-10) + 20.*(t-(680)).*heaviside((t-(680)));

Answer 1

[Walter Roberson]

If you are in a MATLAB Function Block then

heaviside = @(x) x >= 0;

[Walter Roberson]

function y = fcn(t)
   y = zeros(size(t));
   heaviside = @(x) x >= 0;
   y = 20.*t.*heaviside(t) - 40.*(t-10).*heaviside(t-10) + 20.*(t-(680)).*heaviside((t-(680)));
end

[Marko Boskovic]

Thank you Walter!