Robust Control dksyn command issue

I am working on system with following ss matrices A,B,C,D

A=[ 0 0 0 1 0 0

0 0 0 0 1 0

0 0 0 0 0 1

222.74 -199.79 3.0972 0 0 0

-234.46 245.08 -14.053 0 0 0

5.906 -22.835 17.016 0 0 0];

B=[ 0 0 0

0 0 0

0 0 0

0.85921 -1.7636 0.92717

-0.90439 2.0138 -1.2128

0.022782 -0.12615 0.22853];

C=eye(6,6);

D=zeros(6,3);

When i apply dksyn command it shows error "Undefined function 'dksyn' for input arguments of type 'ss'."

when i get tf of G by tf(G) dksyn command shows error of Undefined function 'dksyn' for input arguments of type 'tf'.

Please help me how can i resolve this issue.

Thanks in advance.

Answer 1

[Uttkarsh Jha]

Use of dksyn is not recommended.

Refer to this page for more information on this.

[Shoaib Salim]

Thanks for the answer.

I have to implement dksyn at any cost .Please help me out,

No disturbances, no noise just simple case. How to get P in my case to put in command below;

K,CLP,BND] = dksyn(P,NMEAS,NCONT)

[shahin]

Thank you for your answer. I already designed the H_Infinity controller system . and now I want to design it with MU controller and I don't know the reason for the error.