h_norm

h_norm — H-infinity norm

Calling sequence

[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).