arhnk
arhnk — Hankel norm approximant
Calling sequence
[slm]=arhnk(sl,ord,[tol])
Parameters
| sl | : linear system (syslin list) |
| ord | : integer, order of the approximant |
| tol | : threshold for rank determination in equil1 |
Description
computes slm, the optimal Hankel norm approximant of the
stable continuous-time linear system sl with matrices [A,B,C,D].
Examples
A=diag([-1,-2,-3,-4,-5]);B=rand(5,1);C=rand(1,5);
sl=syslin('c',A,B,C);
slapprox=arhnk(sl,2);
[nk,W]=hankelsv(sl);nk
[nkred,Wred]=hankelsv(slapprox);nkred
See also
equil, equil1, hankelsv
