Error using tf (transfer function)

2019 2 22
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更新时间：2020 11 2
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Getting the following error:
>> sys = tf([1 2],[1 0 10])
Undefined function 'tf' for input arguments of type 'double'.
Using R2018b and control system toolbox is installed.

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Fangjun Jiang
Fangjun Jiang 2019-2-22

0 个投票

run "which -all tf" to find out

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James Phegley
James Phegley 2019-2-22
>> which -all tf
C:\Program Files\MATLAB\R2018b\toolbox\mpc\mpc\@mpc\tf.m % mpc method
C:\Program Files\MATLAB\R2018b\toolbox\ident\ident\@idParametric\tf.m % idParametric method
C:\Program Files\MATLAB\R2018b\toolbox\shared\controllib\engine\@StaticModel\tf.m % StaticModel method
C:\Program Files\MATLAB\R2018b\toolbox\dsp\filterdesign\@mfilt\tf.m % mfilt method
C:\Program Files\MATLAB\R2018b\toolbox\signal\signal\@dfilt\tf.m % dfilt method
Fangjun Jiang
Fangjun Jiang 2019-2-22
编辑：Fangjun Jiang 2019-2-22
while other tooltoxes have tf() for transfer function, your Control System Toolbox was not there.
Should have
\MATLAB\R2018b\toolbox\control\ctrlmodels\@tf\tf.m
check your Control System Toolbox
ver control

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106/5000
Hi:
I have problems when using the "tf" command
Please could you help me in this regard.
link video youtube: https://youtu.be/Xr3kPGrHGSg

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Fangjun Jiang
Fangjun Jiang 2020-11-2
The error message indicates you don't have one of those needed toolboxes

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