I try to run this but it appears error. Why?
syms B_m J_m K m_c r J_p B_1 Kt J_m
A=[-B_m/J_m -1/J_m 0;
K 0 -K/r;
0 1/(m_c*r+J_p/r) -B_1/(m_c+J_p/r^2)]
B = [Kt/J_m;
0;
0]
C = [0 0 0]
D = [0]
[b,a] = ss2tf(A,B,C,D)
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