How to write a Transfer Function

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Alex yarker
Alex yarker 2020-9-27
移动：Sam Chak 2023-10-29
I am trying to setup understand how to setup a transfer function, I input:
>> num = [1 1];
>> den = [1 2 1 5];
>> system = tf(num,den)
And expect the below answer but I keep getting an error message after inputting the system line:
'tf' requires one of the following:
Control System Toolbox
DSP System Toolbox
Model Predictive Control Toolbox
Signal Processing Toolbox
>>Transfer function: s + 1 ------------------- s^3 + 2 s^2 + s + 5
Any help would be appreciated

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-9-27
You need to have the control system toolbox: https://www.mathworks.com/help/control/index.html for using tf() function. It seems that you haven't installed this toolbox. Check the output of
ver control
If you get a warning, it means that the toolbox is not installed.
  2 个评论
Alex yarker
Alex yarker 2020-9-27
I got a warning message so I downloaded the Control Toolbox, the formulas now work as expected and I've stopped tearing my hair out, thanks very much.

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