tf toolbox not recognized function

Question

Yuanju Chao 2019-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/493379-tf-toolbox-not-recognized-function

回答： enescan 2024-5-15

Hi

I have signal processing toolbox installed but when I type tf transfer function, it said unrecognized function

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Answer 1

Star Strider 2019-11-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/493379-tf-toolbox-not-recognized-function#answer_403508

在 MATLAB Online 中打开

I have no idea what you are doing.

This works when I run it (in R2019b):

s = tf('s');
transfer_function = (s^2 + 2*s + 5)/(s^3 + 10*s^2 + 5*s  + 42);
sys = tf(transfer_function)

and produces:

sys =
 
       s^2 + 2 s + 5
  -----------------------
  s^3 + 10 s^2 + 5 s + 42
 
Continuous-time transfer function.

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Star Strider 2019-11-26

Yuanju Chao’s Answer moved here —

R = 37.56e3;

C = 0.156e-12;

G1 = 1/R; % R2N in schematic

C2 = (C * 46)/2; % C120/2 in schematic

G4 = G1 ; % R3N in schmeatic

G3 = 2 * G1; % R4N in schematic

C5 = 32 * C; % C2N in schemaitc

b0 = - G1*G3;

a2 = C2 * C5;

a1 = C5 * ( G1+ G3 + G4);

a0 = G3*G4;

Ts2ndPZR = tf ( b0, [a2,a1,a0])

Unrecoginzed function of variable 'tf'

Star Strider 2019-11-26

在 MATLAB Online 中打开

To use the tf function, you must have the Control System Toolbox licensed and installed.

To find out if you do, type:

ver control

in your Command Window or a script.

When I do that it produces:

-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.7.0.1247435 (R2019b) Update 2
MATLAB License Number: #####
Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 17763)
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
Control System Toolbox                                Version 10.7        (R2019b)