create a variable that changes its value(polynomial equation) for different time periods

Hi guys, i am trying to match a graph of my simulink model with a graph of a standarized model.

I have my lateral speed against time. This graph depends on a variable and the time. So with linear fitting i am getting two different polynomials(equations) to multiply to my graph to make it similar to the graph of the standarized model.

What i still dont know how to do is to code it. What i need to do is create a variable that changes its value(polynomial equation) for different time periods, so for example from the time 0 to 2, the variable will be a polynomial equation, and for the time 2 to 4 the variable will be other polynomial equation.

Regards,

Alejandro

Answer 1

[Pat Gipper]

Maybe something like this.

[Alejandro Argote Oramas]

Thanks, i already had something like that in my code, but u gave me an idea to solve it properly!