tf toolbox not recognized function

Hi

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

Answer 1

[Star Strider]

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.

[Star Strider]

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]

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)

For obvious reasons, I have not posted my License Number.

Answer 2

[enescan]

% Transfer fonksiyonu parametreleri

K = 1; % Kazanç değeri, bunu isteğinize göre ayarlayabilirsiniz

numerator = K * [1 3 2]; % Pay kısmı (s+1)(s+2)

denominator = [1 4 16 0 0]; % Payda kısmı s^4 + 4s^3 + 16s^2

% Transfer fonksiyonunu oluşturma

G = tf(numerator, denominator);

% Bode diyagramı çizme

figure;

bode(G);

title('Denetimsiz Sistem Bode Diyagramı');

grid on;

% Nyquist diyagramı çizme

figure;

nyquist(G);

title('Denetimsiz Sistem Nyquist Diyagramı');

grid on;