Use of functions ctrb and poly

I have 2 matrices A, B. I use ctrb(A,B) to get matrix P and then try to use poly(P) to get the polynomial of P but get error msg saying it requires a vector or square matrix. Any suggestions?

Answer 1

[Sam Chak]

No error message generated. You should provide yours to find out the actual issue.

A   = [ 0  1;
       -1 -2];
B   = [ 0;
        1];
P   = ctrb(A, B)

P = 2×2

0 1 1 -2

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cp  = poly(P)

cp = 1×3

1.0000 2.0000 -1.0000

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[Ken]

Thanks - my B matrix was 2X2, SHOULD BE 2X1 like yours