Problem using tf to perform a transfer function.

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Leaysia Lampkin
Leaysia Lampkin 2023-8-31
回答： Sam Chak 2023-8-31
I was trying to mimic an m-script file for completing a transfer function from my textbook. I ran into an issue where I receive an error "Undefined functin 'tf' for input arguments of type 'double'."
My code is as follows:
numg=[6 0 1];
deng=[1 3 3 1];
sysg=tf(numg,deng);
Undefined functin 'tf' for input arguments of type 'double'.
It is important to know that the code comes from the textbook. Could I be missing a package?

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采纳的回答

Star Strider
Star Strider 2023-8-31
Ran in:
You need to have the Control System Toolbox licensed and installed.
With that, the code works appropriately —
numg=[6 0 1];
deng=[1 3 3 1];
sysg=tf(numg,deng)
sysg = 6 s^2 + 1 --------------------- s^3 + 3 s^2 + 3 s + 1 Continuous-time transfer function.
.

更多回答（1 个）

Sam Chak
Sam Chak 2023-8-31
Hi @Leaysia Lampkin
If you are unable to obtain the Control System Toolbox, many useful MATLAB-compatible functions can still be executed on Octave Online. These functions include ss, tf, zpk, damp, pole, zero, rlocus, bode, nyquist, pid, feedback, minreal, dcgain, step, initial, impulse, lsim, place, lqr, lyap, etc.

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