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From: Shahruk on 9 May 2010 13:56
Hi,
After constructing the continuous-time state-space model object I am trying to specify the parameter values in the structure matrices that I do not want to estimate
% Set up the model matrices
A = [(-Rl-Rc)/L -1/L;1/C 0];
B = [1/L Rc/L;0 -1/C];
C = [Rc 1];
D = [0 -Rc];
K = [0;0];
x0 = [0;0];


m = idss(A,B,C,D,K,x0,'Ts',0);

m.As =[(-Rl-Rc)/L NaN;1/C 0];
m.Bs =[NaN Rc/L;0 -1/C];
m.Cs = m.c;
m.Ds = m.d;
m.Ks = m.k;
m.x0s = [NaN;0]
m.NoiseVariance = [0.01 0; 0 0.1];


m = pem(data,m)



.... But I am getting the following error.

??? Error using ==> mrdivide
Matrix dimensions must agree.

Error in ==> grey1 at 33
m.As =[(-Rl-Rc)/L NaN;1/C 0];

Could anyone help me...am stuck in it for a long time :(
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