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)));MATLAB: Heaviside function in simulink
MATLABsimulinksimulink function
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Yes, your code is correct. Following will work
t = 0:0.01:10;y = (t.^2-1).*[heaviside(t)-heaviside(t-2)]+(2.*t-3).*[heaviside(t-2)-heaviside(t-5)]+sin(t).*heaviside(t-5);plot(t,y)However, an easier solution is to use piecewise()
syms xf(x) = piecewise(0<=x<2, x^2-1, 2<=x<5, 2*x-3, 5<=x, sin(x));fplot(f, [0 10])The heavside function is not the same as the sign function, you can't simply change one for another. If you want to write the sign function in terms of a heavside function you can use the following relation:
Where 
is the heavside function.
is the heavside function.
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