error) ss2tf is not read

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Ji Hoon Kong
Ji Hoon Kong 2020-5-1
评论： Ameer Hamza 2020-5-3
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?
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Ji Hoon Kong
Ji Hoon Kong 2020-5-3
编辑：Ameer Hamza 2020-5-3
[num, den] = ss2tf(a,b,c,d);
output is
'a' is not unrecognized function or variable.
Ji Hoon Kong
Ji Hoon Kong 2020-5-3
编辑：Ameer Hamza 2020-5-3
my matlab code is
m1 = 1;
m2 = 1;
k = 1;
t = linspace(0,10,173);
a =[0 1 0 0; -1*k/m1 0 k/m1 0;0 0 0 1; k/m2 0 -1*k/m2 0];
b = [0;1/m1;0;0];
c = [0 0 1 0];
%output measurement is the only x2
d = 0;
[num, den] = ss2tf(a,b,c,d);
step(num,den)
and output is
error occurance: ^ (line 51)
The dimensions are incorrect and the matrix cannot be rounded. Verify that the matrix is square and the exponential value is scalar. To perform matrix power operations by element, '.Please use '^'.
error occurance: poly (line 2)
output=x^3+x^2+x+1;
error occurance: ss2tf (line 30)
den = poly(p);
error occurance: asdfg (line 10)
[num, den] = ss2tf(a,b,c,d);

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Ameer Hamza
Ameer Hamza 2020-5-3
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.
  2 个评论
Ji Hoon Kong
Ji Hoon Kong 2020-5-3
Thank you for your help. At first, only ss2tf appeared to be an error without these errors, so I thought it was not the cause. I wish you good health.
Ameer Hamza
Ameer Hamza 2020-5-3
I am glad to be of gelp.

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