Error occurs while executing state space parameters using idss?

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PARASSURAM 2014-10-10

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编辑： Qandeel 2015-3-25

i'm new to state space modelling. while i try to execute A,B,C,D,E parameters using idss, it displays the error as " The sizes of state-space parameter matrices must be consistent with size and order of the model. "

The code i used in m file are as follows

 A=[-1/tg1 0 -1/(tg1*r1) 0 0 0 0; 1/tt1 -1/tt1 0 0 0 0 0; 0 kp1/tp1 -1/tp1 -kp1/tp1 0 0 0; 0 0 t12 0 0 0 -t12; 0 0 0 0 -1/tg2 0 -1/(r2*tg2); 0 0 0 0 1/tt2 -1/tt2 0; 0 0 0 -(a12*kp2)/tp2 0 kp2/tp2 -1/tp2]
 B=[1/tg1 0 0 0 0 0 0; 0 0 0 0 1/tg2 0 0]'
 C1=[0 0 1 0 0 0 0]
 C2=[0 0 0 0 0 0 1]
 D=0
 K=[0 0 -kp1/tp1 0 0 0 0; 0 0 0 0 0 0 -kp2/tp2]'
 SYS1 = idss(A,B,C1,D,K)
 SYS2 = idss(A,B,C2,D,K)

Can anyone help me?

Thanks in advance.

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采纳的回答

Mischa Kim 2014-10-10

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编辑：Mischa Kim 2014-10-10

PARASSURAM, check the size of the matrices.

It looks like your D matrix needs to be a 1-by-2 (rather than a 1-by-1). K should be a 2-by-7 (rather than 7-by-2).

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PARASSURAM 2014-10-10

I have found my mistake. 'K' should be used as two matrix. Like, K1=[0 0 -kp1/tp1 0 0 0 0] K2=[0 0 0 0 0 0 -kp2/tp2]

Qandeel 2015-3-25

编辑：Qandeel 2015-3-25

I am also facing problems when using the idss command. Can you tell how do you find the output and states when you define a system by the idss command instead of ss command. The 'lsim' does not work with idss.

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