Parse error at u: usage might be invalid MATLAB syntax.

I want to draw a curve of a cubic equation in SIMULINK, which shows a syntax error. I don’t know what the error is.

Answer 1

[Dave B]

If you want to multiply you need a *

y=-0.0811*u^3...

Also consider if you want to raise a vector to the power of 3, you probably want .^

y=-0.0811*u.^3...

[BO-HAO LIN]

I made a stupid mistake, so do I have to modify it like this?

y=-0.0811*u.^3+13.573*u.^2-787.08*u+18366;

[Dave B]

That looks good to me