('tf' requires one of the following) "tf commend is not working" HELP PLS!

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Mesut Yilmaz
Mesut Yilmaz 2019-11-13
评论： Sam Chak 2025-3-26，6:44
1.png
this simple command doesn't work even though I've entered all commands correctly
thx for answers...

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采纳的回答

M
M 2019-11-13
Your code is right, but you do not have the required toolbox. The function tf is part of the 4 toolbox listed in the error message. You have to install at least one of them to use tf.

更多回答（2 个）

Supriya Joshi
Supriya Joshi 2020-7-27
%poles and zeros num=[1 4 3]; den=[3 19 27 35]; z=tf(num,den) %z1=roots(num) %p1=roots(den) [z1,p1,k]=tf2zp(num,den) pzmap(z)
jean carlos
jean carlos 2025-3-26，4:12
por que me sale este error me podra ayudarme por favor
%% LGR
Gzl=tf(Numz,Denz,-1);
rlocus(Gzl); %LGR
axis([-1.5 1.5 -1.25 1.25]);
title('LGR');
>> jean
Unrecognized function or variable 'Numz'.
Error in jean (line 2)
Gzl=tf(Numz,Denz,-1);
Unrecognized function or variable 'Numz'
  2 个评论
Stephen23
Stephen23 2025-3-26，6:20
"Unrecognized function or variable 'Numz'"
Solution: define Numz.
Question: what do you expect Numz to be?
Sam Chak
Sam Chak 2025-3-26，6:44
Ran in:
@jean carlos, You need to specify the numerator and denominator coefficients ordered in descending powers of z.
Numz = [2, 0];
Denz = [4, 0, 3, -1];
Gzl = tf(Numz, Denz, -1)
Gzl = 2 z --------------- 4 z^3 + 3 z - 1 Sample time: unspecified Discrete-time transfer function.

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