tf function doesn't work
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when I try to use tf function this is what I get :
>> s = tf('s')
Unrecognized function or variable 'tf'.
Did you mean:
>> s = tfe('s')
1 个评论
lounis chehrit
2021-6-10
It seems that the Control system toolbox is not installed !
You have to install It first !
采纳的回答
Ameer Hamza
2020-9-26
编辑：Ameer Hamza
2020-9-26
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 have the toolbox installed, it will display the version of toolbox otherwise you don't have the toolbox.
4 个评论
EL BIARI AYOUB
2020-9-29
Erick Hernán Huillca Apaza
2022-5-5
I have it, but it seems : Warning: No properly formatted Contents.m file was found for 'control'.
> In ver (line 58) .................. at the final
Walter Roberson
2022-5-5
You might need to reinstall .
Fernanda
2024-3-11
Muchas gracias!!
更多回答（1 个）
clear all ;
close all ;
clc ;
s=tf('s');
G=0.8/(0.5*s+1);
H=feedback(G,1);
step(H);
grid
1 个评论
Walter Roberson
2025-1-5
I do not understand how this answers the question about tf() not being found?
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