Name

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