$\begingroup$Please can someone write a command in Matlab for calculating $H_{\infty}$ norm for the following system:
$$\frac{d}{dt}z(t)=Az(t)+Bu(t)+Fw(t)$$ $$y(t)=Cz(t)+Du(t)$$
where $A$, $B$, $C$, $D$, and $F$ are real valued 2×2 matrices.
I have tried the following code, but it does not work:
A = [0 2; 8 1] B = [1 0; 2 1] F = [-1 2; -4 3] C = [2 0; 0 1] D = [1 0; 0 0] sys = ss(A,B,F,C,D); norm(sys,inf) 1 Answer
$\begingroup$The $\mathcal{H}^{\infty}$ norm is specified from one vector input to one vector output. Right now, you have written things with two inputs. So you need to reorganize your $A,B,C,D$ matrices.
$\endgroup$
