polynomial function to transfer function in matlab

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Chennam
Chennam on 28 Mar 2024 at 10:05
Commented: Chennam on 28 Mar 2024 at 18:53
i have a 4th order polynomial function y = f(x) , where "y" is my output and "x" is my input. is there any way to get transfer function of the equation.
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Michael
Michael on 28 Mar 2024 at 10:33
y = f(x) where f(x) is a polynom of 4th order is an nonlinear system. Only LTI (linear time-invariant) systems can be described via transfer functions.

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Answers (1)

Yash
Yash on 28 Mar 2024 at 10:35
Yes, you can obtain the transfer function of a 4th order polynomial equation in MATLAB. However, it is important to note that a polynomial equation does not have a unique transfer function representation. The transfer function depends on the system dynamics and the specific input-output relationship.
If you have a specific system in mind, such as a linear time-invariant (LTI) system, you can use the tf function in MATLAB to create a transfer function object. Here's an example:
coeff = [a4, a3, a2, a1, a0]; % Define the coefficients of the polynomial equation
sys = tf(coeff); % Create the transfer function object
disp(sys); % Display the transfer function
Replace a4, a3, a2, a1, a0 with the actual coefficients of your polynomial equation. The resulting transfer function object sys can be used for further analysis and design. Read more about the tf function here: https://www.mathworks.com/help/control/ref/tf.html
Please note that if your system is not a linear time-invariant system, the transfer function representation may not be appropriate. In such cases, other mathematical models or techniques may be more suitable.

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