MATLAB: Error) ss2tf is not read

errorMATLABss2tf

In this way, the ss2tf function is not read. Other computers can read the same code, but not mine. It has already been reinstalled for the third time and control system toolbox is also installed. What is the solution?

Best Answer

Ah!! You see. Posting the full error message made the problem clear. You have defined a function named 'poly'. MATLAB also has a function named poly. This confuses MATLAB. Change the name of your function to something else.

Type

which poly -all

it will give you a list of functions. One of those functions was created by you. Change its name to something else.

Related Solutions

MATLAB: Error when trying to obtain transfer function from MIMO state-space representation in MATLAB

You put an ' sign to your B matrix, therefore with this sign, it contains 2 rows and it gives error. But changing it will not be enough since your D matrix is entered wrong. You should also change it. Lastly, since you have 2 inputs, you also should use ss2tf differently. The resulting code:

A = [0 2 5 -4;0 0 0 0;0 0 0 1;-6 0 -1 -2]; 
B = [1 2;0 0;0 0;0 5]; 
C = [1 0 0 0;0 1 0 0;0 0 1 0; 0 0 0 1]; 
D = zeros(4,2);
[nom1, denom1] = ss2tf(A,B,C,D,1);% for the first input, I wrote 1. You can change it and write 2.

As a result, you have 2 inputs, 4 outputs. You will obtain 8 transfer functions, 4 for each input.

MATLAB: How can i solve part 2 … should i convert the statespace to tf

Actually you do not need to do that since they will eventually give the same result but since the question wants you to do it, write the following code:

Gs(1)=tf(num(1,:),den);
Gs(2)=tf(num(2,:),den)
step(Gs)

and you will see that you get identical results.

Best Answer

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MATLAB: Error when trying to obtain transfer function from MIMO state-space representation in MATLAB

MATLAB: How can i solve part 2 … should i convert the statespace to tf

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