H-infinity norm
[hinfnorm [,frequency]]=h_norm(sl [,rerr])
:sl the state space system ( syslin list) : :rerr max. relative error, default value 1e-8 : :hinfnorm the infinity norm of Sl : :frequency frequency at which maximum is achieved :
produces the infinity norm of a state-space system (the maximum over all frequencies of the maximum singular value).